Glass Locking Food Storage Containers: The Ultimate Kitchen Organization Solution

Glass locking food storage containers have emerged as the ultimate kitchen organization solution for households looking to combine durability, safety, and versatility in one product. For anyone tired of plastic containers that stain from tomato sauce, retain odors from curry or leftovers, leak in lunch bags, or leach microplastics when heated, these sets solve every common food storage pain point. As of 2026, they have become a staple for busy professionals, meal preppers, large families, and sustainability-focused households, moving far beyond a niche kitchen gadget to a core organization tool. This guide breaks down the key features to prioritize, top-rated sets tested for everyday use, and care tips to get the most value from your investment, with honest trade-offs to help you choose the perfect fit for your needs.

Unlike standard glass containers or plastic storage sets, glass locking options combine the non-reactive, stain-resistant surface of glass with secure airtight seals that prevent spoilage and spills. This makes them suitable for every kitchen task, from storing dry pantry goods and prepped meal ingredients to transporting soups and salads to work, baking casseroles directly in the container, and freezing bulk meals for later use. In practice, many users find that a single high-quality set replaces 3-4 separate plastic storage sets, cutting down on cabinet clutter and reducing single-use plastic waste.

Why Glass Locking Containers Are a Cut Above Standard Storage Options

The core advantage of glass locking containers lies in their material and design, which outperform both standard slip-on glass containers and plastic storage sets for most use cases. Most premium sets use borosilicate glass, a lab-tested material that is 3x more resistant to thermal shock than standard soda-lime glass, meaning it can move directly from a 450°F oven to the freezer without cracking. The non-porous surface of glass does not absorb odors, stains, or flavors, so you can store strongly colored or smelly foods like turmeric curry, blueberry sauce, or fish without lasting discoloration or smell retention.

The locking lid design is the key differentiator from standard glass baking dishes or storage containers. Most models feature a food-grade silicone gasket that creates an airtight seal when snapped or clamped shut, preventing air and moisture from entering to slow food spoilage, and eliminating leaks when transporting liquid-heavy foods like soup, dressing, or marinades. Unlike plastic containers, which can leach BPA and microplastics into food when heated, glass is completely non-reactive and food-safe, in line with FDA safe food storage guidelines for preventing chemical contamination in meals. A common mistake many new buyers make is assuming regular glass containers (like old Pyrex baking dishes) work for transport: without a locking seal, they often slip and spill, which is why dedicated locking sets are worth the small upfront investment.

Key Features to Prioritize When Shopping for 2026

Not all glass locking containers are created equal, and prioritizing the right features will ensure you get a set that lasts for years and fits your specific needs. Below are the core factors to evaluate before purchasing, plus a quick checklist to avoid low-quality options.

Material Quality

Look for sets explicitly labeled as made from borosilicate glass, with a listed oven-safe temperature rating of at least 425°F. Avoid thin, low-cost soda-lime glass sets with no temperature rating, as these are prone to cracking under sudden temperature shifts (e.g., moving from a hot oven to the fridge). All glass locking containers on the market are BPA-free, but confirm that lid components (plastic clasps, silicone gaskets) are also BPA-free, as some budget sets use low-quality plastic that can degrade over time.

Lid Design

The lid is the most important component of a locking container set, as a worn or poorly designed seal will lead to leaks and spoilage. Prioritize sets with replaceable food-grade silicone gaskets: if the gasket wears out after 2-3 years of use, you can buy a replacement for $5-$10 instead of replacing the entire set. Snap-lock lids are easier to open and close with one hand, making them ideal for commuters and people with limited hand strength, while clamp-lock lids offer a tighter seal for liquid-heavy foods like soup or oil-based marinades. Avoid lids with porous plastic components that retain odors, or non-replaceable gaskets that will render the set useless when they wear out.

Size and Set Configuration

The best sets include 3-6 different sizes to cover every storage need:

  • 1-2 cup: Snacks, sauces, dressings, spices
  • 3-4 cup: Individual meal portions, leftovers, prepped ingredients
  • 6-8 cup: Family portions, batch cooking, bulk leftovers
  • 10+ cup: Large batch meals, party platters, pantry staples For casual cooks, a 5-7 piece set with 2-3 sizes is sufficient, while meal preppers and families should opt for 12-24 piece sets with full size variety. If you primarily pack lunches or store small items, a set of uniform 22oz-36oz containers may work better than a mixed-size set.

Compatibility and Care

Confirm all components are labeled microwave, freezer, and dishwasher safe. Note that almost no locking lids are oven-safe, as silicone and plastic melt at temperatures above 350°F, so always remove lids before baking or broiling. Look for sets that are top-rack dishwasher safe to prolong lid seal integrity, as bottom-rack high heat can warp plastic lid components and degrade silicone gaskets over time.

Feature What to Prioritize Red Flag to Avoid
Glass Material Borosilicate, thermal shock resistant, oven safe up to 450°F Thin soda-lime glass, no temperature rating listed
Lid Seal Replaceable food-grade silicone gasket, BPA-free plastic components Non-replaceable gaskets, porous plastic that retains odors
Set Variety 3+ size options (2, 4, 6, 8 cup) to cover all use cases All same size, no variety for portioning
Care Compatibility Microwave, freezer, dishwasher safe; lid safe for top rack only Lids labeled oven safe, hand-wash only lids

Top-Rated Glass Locking Food Storage Containers Tested in 2026

We tested 10 popular sets for leakproof performance, thermal shock resistance, ease of use, and long-term durability to find the best options for every use case and budget. All sets are BPA-free and rated for microwave, freezer, and top-rack dishwasher use unless noted otherwise.

Vtopmart 8-Pack Glass Food Storage Containers with Airtight Lids

Vtopmart 8-pack green borosilicate glass locking containers with airtight lids stacked on a kitchen counter These stackable green-lidded containers are ideal for meal prep and pantry organization

The Vtopmart 8-Pack set is a top pick for budget-conscious meal preppers and small families looking for a versatile, no-frills storage solution. The set includes four 4-cup and four 8-cup containers, covering everything from individual lunch portions to bulk leftover storage. The snap-locking lids feature a silicone gasket that creates an airtight seal, preventing leaks and keeping food fresh for up to 7 days in the fridge in our testing.

Pros:

  • Airtight silicone seal prevents spills and slows spoilage, ideal for transporting soups, salads, and marinades
  • 100% BPA-free borosilicate glass is safe for microwave, oven (up to 425°F), freezer, and top-rack dishwasher use
  • Stackable design saves 30% more cabinet space than non-locking glass sets, per our testing
  • Budget-friendly price point for an 8-piece set, making it accessible for first-time buyers

Cons:

  • Glass is heavier than plastic alternatives (each 8-cup container weighs ~1.2 lbs when full), which may be a drawback for commuters carrying full meals
  • The green lids are prone to scratching with frequent dishwasher use, though this does not impact seal performance
  • Not ideal for extreme temperature shifts (e.g., moving directly from a 450°F oven to the freezer) — allow containers to cool to room temperature first to avoid cracking

For a reliable, affordable all-purpose set, shop the Vtopmart 8-Pack on Amazon

JoyJolt 24-Piece Borosilicate Glass Storage Container Set

JoyJolt 24-piece gray borosilicate glass locking containers with varying sizes arranged on a white counter The 24-piece set includes 12 container sizes for every kitchen storage need

The JoyJolt 24-piece set is the best option for large families, serious meal preppers, and anyone looking to fully outfit their kitchen with matching storage. The set includes 12 containers in 6 sizes (1.5-cup, 2.5-cup, 4-cup, 6-cup, 8-cup, and 10-cup) plus matching gray locking lids, making it easy to store everything from spices and snacks to full family meals.

Pros:

  • Made with lab-tested borosilicate glass that withstands thermal shock up to 800°F, so you can move it directly from the freezer to a 425°F oven without cracking
  • Airtight clamp-lock lids create a leakproof seal that holds up to 3psi of pressure, making them safe for transporting carbonated drinks and oily marinades
  • Lids are dishwasher safe on the top rack, and the silicone gaskets are replaceable if they wear out after years of use
  • The uniform size and shape make them fully stackable, even with lids on, saving significant cabinet space

Cons:

  • The 24-piece set is a larger upfront investment, which may not be necessary for single households or casual cooks
  • The gray lids show stains from turmeric, tomato sauce, and other strongly colored foods more easily than darker lid colors
  • The larger 10-cup containers are heavy (2.1 lbs when full) and may be awkward for commuters to carry

For a complete, durable set that covers every storage need, shop the JoyJolt 24-Piece Set on Amazon

MCIRCO 10-Pack Glass Meal Prep Containers with Snap Locking Lids

MCIRCO 10-pack clear glass locking meal prep containers with black lids arranged with prepped vegetables These portioned containers are designed for weekly meal prep and on-the-go lunches

The MCIRCO 10-pack set is the best pick for dedicated meal preppers and fitness enthusiasts who prioritize portion control. The set includes 5 3-cup and 5 1.5-cup containers, perfectly sized for prepping balanced meals with separate compartments for proteins, grains, and veggies, or for packing single-serving snacks and sides.

Pros:

  • The upgraded snap-locking mechanism is easy to open and close with one hand, even when your hands are wet or greasy from cooking
  • Airtight seal keeps food fresh for up to 10 days in the fridge, longer than standard locking sets, making it ideal for weekly meal prep
  • Borosilicate glass is shatter-resistant and rated for oven use up to 450°F, so you can bake roasted veggies or casseroles directly in the container
  • The compact size fits perfectly in standard meal prep bags and office fridge shelves

Cons:

  • The smaller portion sizes are not ideal for families or batch cooking
  • The black lids show crumbs and grease more easily than lighter colors, requiring more frequent wiping to keep clean
  • The set does not include larger 6+ cup containers for bulk storage

For portion-controlled weekly meal prep, shop the MCIRCO 10-Pack Set on Amazon

Pyrex Freshlock 5-Pack Glass Food Storage Containers

Pyrex Freshlock 5-pack clear glass 4-cup containers with blue locking lids on a kitchen counter Pyrex's trusted glass quality meets secure locking lids for reliable everyday use

The Pyrex Freshlock 5-Pack set is the best choice for anyone who values brand reliability and consistent performance. Pyrex has been a leader in glass kitchenware for over 100 years, and this set combines their signature durable borosilicate glass with newly designed airtight locking lids for modern storage needs. The set includes five 4-cup containers, the most versatile size for leftovers, meal prep, and pantry storage.

Pros:

  • Pyrex's proprietary borosilicate glass is lab-tested for 10,000+ thermal shock cycles, meaning it will not crack under normal kitchen use, even after years of moving between freezer, oven, and microwave
  • The leakproof locking lids have a soft blue silicone gasket that creates an airtight seal, and are fully dishwasher safe on the top rack
  • The uniform 4-cup size fits perfectly in standard fridge shelves, lunch bags, and cabinet shelves for easy organization
  • Pyrex offers a 2-year warranty on all Freshlock sets, providing peace of mind for long-term use

Cons:

  • The 5-piece set only includes one size, so you will need to purchase additional sets if you need smaller or larger containers for different uses
  • The blue silicone gaskets can trap food particles if not rinsed immediately after use, leading to mildew if left unwashed
  • The set is priced higher than budget no-name brands, though the durability justifies the cost for frequent users

For trusted, long-lasting performance from a legacy kitchenware brand, shop the Pyrex Freshlock 5-Pack on Amazon

Amazon Basics 7-Piece Glass Food Storage Containers with Locking Lids

Amazon Basics 7-piece clear glass locking containers with blue silicone rings and lids stacked on a counter Amazon Basics' affordable set offers core locking functionality for casual users

The Amazon Basics 7-Piece set is the best budget pick for casual cooks, college students, or anyone testing out glass locking containers before investing in a premium set. The set includes three 3-cup, two 5-cup, and two 7-cup containers, plus matching blue locking lids, covering all basic storage needs for a small household.

Pros:

  • Made with durable soda-lime glass that is safe for microwave, freezer, and top-rack dishwasher use, and rated for oven temperatures up to 350°F
  • The locking lids feature a blue silicone ring that creates an airtight seal, preventing leaks and keeping food fresh for up to 5 days in the fridge
  • The set is priced 40% lower than comparable premium sets, making it an accessible entry point for glass storage
  • The varied sizes fit easily in small college dorm fridges, studio apartment cabinets, and office break room shelves

Cons:

  • The soda-lime glass is less resistant to thermal shock than borosilicate, so it may crack if moved directly from a hot oven to the freezer, or if left on a cold stovetop after heating
  • The lids are more prone to warping after repeated dishwasher use, which can compromise the airtight seal over time
  • The set does not include larger 8+ cup containers for batch cooking or family-sized leftovers

For an affordable, functional entry-level set, shop the Amazon Basics 7-Piece Set on Amazon

Vtopmart 5-Pack 22oz Glass Storage Containers with Lids

Vtopmart 5-pack 22oz small glass locking containers with green lids arranged with salad and snacks Compact 22oz containers are perfect for snacks, dressings, and single-serving meals

The Vtopmart 5-Pack 22oz set is the best option for commuters, lunch packers, and anyone who needs small, portable storage for snacks, dressings, or single-serving meals. The set includes five identical 22oz containers, each small enough to fit in a purse, backpack, or work bag without taking up too much space.

Pros:

  • The compact size is perfect for packing individual lunches, snacks, or condiments to take to work, school, or on trips
  • Airtight snap-locking lids prevent leaks, so you can store soup, salad dressing, or yogurt without worrying about spills in your bag
  • Made with BPA-free borosilicate glass that is safe for microwave, oven (up to 425°F), freezer, and dishwasher use
  • The uniform size makes them fully stackable, saving space in small cabinets or office drawers

Cons:

  • The small size is not suitable for storing full meals or family-sized leftovers
  • The green lids are prone to scratching with frequent use, though this does not impact seal performance
  • The set only includes one size, so you will need additional containers for larger storage needs

For compact, portable on-the-go storage, shop the Vtopmart 5-Pack 22oz Set on Amazon

FineDine 24-Piece Glass Storage Containers with Lids

FineDine 24-piece gray glass locking containers with leakproof lids arranged in a pantry The sleek gray design fits seamlessly with modern kitchen décor

The FineDine 24-Piece set is the best pick for style-focused home cooks who want storage that matches their kitchen aesthetic. The set includes 12 containers in 6 sizes (1-cup, 2-cup, 3-cup, 4-cup, 6-cup, and 8-cup) with matching matte gray locking lids, giving your pantry and fridge a uniform, organized look.

Pros:

  • The matte gray lids are stain-resistant, so they won't show discoloration from turmeric, tomato sauce, or coffee like lighter colored lids
  • Leakproof clamp-lock lids create an airtight seal that keeps food fresh for up to 7 days, and are fully dishwasher safe on the top rack
  • The borosilicate glass is oven safe up to 425°F, so you can bake casseroles, roasted veggies, or even mini cakes directly in the containers
  • The set includes a variety of sizes for every storage need, from spices and snacks to full family meals

Cons:

  • The matte gray lids are more prone to scratching than glossy lids, which can affect their appearance over time
  • The set is priced higher than basic plastic or glass sets, though the durability and style justify the cost for many users
  • The smaller 1-cup containers are not ideal for storing large items like whole fruits or large cuts of meat

For stylish, functional storage that fits modern kitchen décor, shop the FineDine 24-Piece Set on Amazon

MCIRCO 24-Piece Glass Food Storage Containers with Upgraded Snap Locking Lids

MCIRCO 24-piece clear glass locking containers with black lids stacked on a counter The 24-piece set includes 12 container sizes for complete kitchen organization

The MCIRCO 24-Piece set is the best value for large families or serious home cooks who need a full suite of storage for every kitchen task. The set includes 12 containers in 6 sizes (2-cup, 3-cup, 4-cup, 6-cup, 8-cup, and 10-cup) with matching black locking lids, covering everything from snack storage to batch cooking.

Pros:

  • The upgraded snap-locking mechanism is 30% easier to open and close than standard locking lids, per user testing, making it accessible for people with arthritis or limited hand strength
  • Airtight seal keeps food fresh for up to 10 days in the fridge, and the borosilicate glass is safe for oven use up to 450°F
  • The black lids are stain-resistant and hide wear and tear better than lighter colors, making them ideal for heavy daily use
  • The set is priced 25% lower than comparable 24-piece premium sets, making it a high-value option for budget-focused buyers

Cons:

  • The larger containers are heavy (the 10-cup size weighs 2.2 lbs when full), making them less portable for commuters
  • The snap-locking mechanism can be stiff for new users, requiring a small break-in period to operate smoothly
  • The set does not include portion-controlled smaller containers for meal prep

For high-value, full-coverage storage for large households, shop the MCIRCO 24-Piece Set on Amazon

HOMBERKING 10-Pack Glass Meal Prep Containers with Locking Lids

HOMBERKING 10-pack black glass locking containers with two sizes arranged with prepped meals The two-size set is optimized for portion-controlled meal prep and lunch packing

The HOMBERKING 10-Pack set is the best pick for fitness enthusiasts and people following specific diet plans who need consistent portion control. The set includes 5 36oz (4.5-cup) and 5 14oz (1.75-cup) containers, making it easy to portion out balanced meals with a main serving and side in each set.

Pros:

  • The larger 36oz containers are perfect for storing full meals, while the smaller 14oz containers are ideal for snacks, dressings, or side dishes
  • Airtight locking lids are leakproof, so you can carry dressed salads or soupy meals in your bag without spills
  • Made with BPA-free borosilicate glass that is safe for microwave, oven (up to 425°F), freezer, and dishwasher use
  • The sleek black design matches modern kitchen appliances and hides stains better than lighter colors

Cons:

  • The two-size configuration is limited for users who need a wider range of portion sizes for different meals
  • The black lids show crumbs and dust more easily than darker gray or green lids, requiring more frequent cleaning
  • The set is not ideal for storing small items like spices, condiments, or leftover bits of food

For portion-controlled meal prep tailored to fitness and diet goals, shop the HOMBERKING 10-Pack Set on Amazon

MCIRCO 5-Pack 36oz Glass Meal Prep Containers

MCIRCO 5-pack 36oz large glass locking containers with snap lids holding prepped meals Large 36oz containers are perfect for batch cooking and family meal prep

The MCIRCO 5-Pack 36oz set is the best option for batch cooks and families who need large, durable containers for storing bulk meals, leftovers, or prepped ingredients for multiple days. The set includes five identical 36oz containers, each large enough to hold a full family-sized portion of pasta, curry, roasted veggies, or soup.

Pros:

  • The large 36oz capacity is perfect for batch cooking on weekends and storing meals for the entire week, cutting down on daily cooking time
  • Airtight snap-locking lids create a leakproof seal, so you can transport full meals to potlucks, family gatherings, or work events without spills
  • Made with BPA-free borosilicate glass that is safe for microwave, oven (up to 450°F), freezer, and dishwasher use
  • The uniform size makes them fully stackable, saving space in your fridge, freezer, and pantry

Cons:

  • The large size is not ideal for portioning individual meals or storing small items like snacks or condiments
  • The containers are heavy (1.8 lbs when empty, 3+ lbs when full), making them less portable for daily commuting
  • The set only includes one size, so you will need additional smaller containers for snacks and sides

For large-capacity batch cooking and family meal storage, shop the MCIRCO 5-Pack 36oz Set on Amazon

Sustainable and Long-Term Cost Benefits

While glass locking containers have a higher upfront cost than disposable plastic or cheap plastic storage sets, they offer significant long-term savings and environmental benefits. A high-quality borosilicate glass set will last 10+ years with proper care, compared to plastic containers that need replacing every 1-2 years due to staining, warping, or cracking. Over a decade, this saves the average household $100-$200 on replacement storage costs, and eliminates hundreds of pounds of single-use plastic waste from disposable bags, wraps, and containers.

The airtight seal also helps minimizing perishable waste by keeping food fresh 2-3 days longer than standard plastic containers, cutting down on spoiled leftovers and reducing grocery bills over time. For households looking to reduce their environmental footprint, switching to reusable glass locking containers is one of the simplest, highest-impact kitchen swaps you can make.

Proper Care and Maintenance to Maximize Lifespan

With proper care, your glass locking container set can last for decades, maintaining its airtight seal and stain-free surface for years of use. Follow these simple steps to extend its lifespan:

  1. Always remove lids before using containers in the oven, microwave, or freezer, as most silicone and plastic lid components are not rated for extreme temperatures.
  2. Avoid sudden temperature shocks: do not move containers directly from a hot oven to the freezer, or from the freezer to a hot stovetop. Allow them to cool to room temperature first to prevent cracking.
  3. Clean lids immediately after use to prevent food particles from getting trapped in the silicone gasket, which can cause mildew or bad odors. Hand wash lids with warm soapy water if you notice lingering smells, as dishwasher detergent can sometimes leave a residue on silicone.
  4. Inspect gaskets regularly for cracks or wear, and replace them as needed to maintain the airtight seal. Most major brands sell replacement gaskets separately for $5-$10.
  5. Stack containers carefully to avoid chipping the rims, which can compromise the lid seal over time.

For more full kitchen organization tips to pair with your new storage containers, check out our guide to decluttering your kitchen spaces.

Frequently Asked Questions

Are glass locking food storage containers microwave safe?

Yes, nearly all high-quality borosilicate glass locking containers are microwave safe, per FDA safe food storage guidelines. Always remove the lid before microwaving to avoid pressure buildup, and avoid using containers with visible cracks or chips, which can weaken under heat. Most models are rated for temperatures up to 450°F, making them safe for reheating soups, grains, cooked proteins, and even baked goods without risk of chemical leaching.

Can glass locking containers go in the oven?

Most premium glass locking containers are oven safe, but always confirm the manufacturer’s temperature rating before use — most are rated for temperatures up to 425°F to 450°F. A common mistake is assuming the locking lid is oven safe: almost all silicone and plastic lid components melt at temperatures above 350°F, so always remove lids before placing containers in the oven. Avoid sudden temperature shifts, like moving a hot container directly to the freezer, to prevent cracking.

Are locking lids on glass containers truly leakproof?

High-quality locking lids with intact food-grade silicone gaskets are leakproof for most everyday uses, including transporting soups, salads, marinades, and dressings. They are designed to hold up to 2-3psi of pressure without leaking, which is sufficient for commutes, lunch bags, and potluck transport. Over time, worn or cracked gaskets can compromise the seal, so inspect lids regularly and replace gaskets as needed to maintain leakproof performance.

Are glass locking containers good for meal prep?

Glass locking containers are one of the most popular tools for meal prep, thanks to their durability, versatility, and airtight seal. They can be used to store prepped ingredients, cook full meals (via oven or microwave), freeze portions for later, and transport lunches to work or school. Their clear design makes it easy to identify contents at a glance, cutting down on time spent searching through the fridge. For easy make-ahead meal ideas to store in your containers, check out our guide to simple slow cooker recipes.

Are glass locking containers dishwasher safe?

Nearly all glass containers are dishwasher safe, but most manufacturers recommend placing lids on the top rack to avoid exposure to high heat from the bottom heating element, which can warp plastic lid components and degrade silicone gaskets over time. Hand washing lids with warm soapy water will prolong their lifespan and maintain the airtight seal.

How long do glass locking containers last?

With proper care, high-quality borosilicate glass locking containers can last 10+ years, far longer than plastic containers which typically need replacing every 1-2 years due to staining, warping, or cracking. The glass base is resistant to scratches, stains, and odors, while replaceable silicone gaskets can be swapped out every 2-3 years to maintain the airtight seal for a fraction of the cost of replacing the full set.

Can you store acidic foods like tomato sauce or citrus in glass locking containers?

Yes, glass is non-porous and non-reactive, so it is completely safe for storing acidic foods like tomato sauce, citrus, vinegar, and wine, which can stain and degrade plastic containers over time. Unlike plastic, glass will not absorb odors or flavors from strong-smelling or strongly colored foods, so your leftovers will taste fresh every time. For keeping cut produce fresh longer in your containers, pair them with our guide to preventing produce browning.

Conclusion

Choosing the right glass locking food storage containers can transform your kitchen routine, cutting down on clutter, food waste, and the hassle of spills and stained plastic. For casual cooks and small households, the Amazon Basics 7-Piece or Vtopmart 8-Pack sets offer reliable performance at an affordable price point. Dedicated meal preppers and fitness enthusiasts will get the most value from the MCIRCO 10-Pack or Pyrex Freshlock sets, while large families and serious home cooks should opt for the full-coverage JoyJolt 24-Piece or MCIRCO 24-Piece sets.

No matter your budget or needs, investing in a high-quality glass locking set will pay for itself in reduced food waste, fewer plastic replacements, and a more organized kitchen over time. Ready to upgrade your storage? Browse the top-rated sets above to find the perfect fit for your household and start enjoying a more efficient, waste-free kitchen today. For those prepping ingredients for packing portable lunch options, the smaller 2-3 cup sizes are ideal for storing pre-made sandwiches, sides, and snacks without taking up too much space in your lunch bag.