Glasslock Accessories Worth Buying: Lids, Seals, and Bags

By Eco Friendly Glass Containers - Glasslock | Published: 2026-10-16

Category: Buying Guides

A practical buying guide to Glasslock replacement lids, silicone seals, and storage bags, with fit rules and honest trade-offs so you spend only on parts that keep your containers working.

Quick answer

Buy replacement lids first when a container still seals but the lid cracks or the tab breaks, and skip silicone seals because Glasslock does not sell gaskets separately. Match every lid to the letter-and-three-digit model code printed on the bottom of your container, then add a storage bag only if you carry meals away from home and need a leak buffer. If you are replacing a whole container rather than a part, compare the price of a new piece against a single lid before ordering.

Start with the model code, not the shape

The fastest way to avoid a wrong order is to flip the container over and read the code on the bottom: a letter group followed by the first three digits. That code tells you which lid family fits. A square lid will not seal a rectangle container even when the width looks close, and a lid that is slightly too large will pop off in a bag. Write the code on a piece of tape stuck to your pantry shelf so you can reorder without emptying the cabinet.

Read the full code, including letters, not just the first number.
Match the code to the lid listing before checking the container shape.
If the code is worn off, measure the rim and compare it to the listed container dimensions rather than guessing by eye.

Replace the whole lid, not just the gasket

Glasslock does not sell silicone gaskets as a separate replacement part, so a stretched or moldy seal means buying a complete new lid. That is a real limitation, and it is worth knowing before you spend time hunting for a gasket-only listing that does not exist. The upside is that a new lid arrives with a fresh gasket already seated, which is usually more reliable than trying to reseat a warped seal into an old frame.

Check the gasket first: if it lifts out easily and looks cloudy or stretched, the lid is the replacement part.
Order the lid size that matches your container code, not the lid you currently own if the code is unclear.
Keep one spare lid on hand for the container you use most often.

When a storage bag is worth adding

A storage bag earns its place if you commute with food, because it contains leaks from a bumped container and keeps condensation off the rest of your bag. It does not replace a good seal, so fix the lid first. If your containers stay on a shelf at home, a bag is optional and the money is better spent on a correctly sized lid. Bags also add bulk, so measure your largest container before choosing one.

Buy a bag only after the lid seals properly.
Choose a bag that fits your largest container flat, not just your smallest.
Skip the bag if you only store food at home.

New container or new lid: the price test

A single replacement lid costs far less than a new container, so replacing the lid is almost always the better value when the glass is intact. The exception is a container you rarely use, where the lid cost plus shipping may not be worth it. If the glass is chipped at the rim, no lid will seal it, and you should replace the container instead. Check the rim with your fingernail before ordering a lid.

Run a fingernail around the rim: a chip means replace the container, not the lid.
Compare the lid price against the container price before ordering.
For a rarely used size, consider consolidating into a container you already own.

Decision rules for buying Glasslock accessories

Rule 1: Match the code before the shape: Find the letter-and-three-digit code on the bottom of the container and match it to the lid listing. Shape alone is not enough because square and rectangle lids are not interchangeable. If you cannot read the code, measure the rim and compare to the listed container dimensions before ordering.
Rule 2: Replace the lid, not the gasket: Glasslock does not sell silicone gaskets separately, so a failed seal means a new lid. Do not spend time searching for a gasket-only part. Budget for a full lid whenever the seal is the problem.
Rule 3: Add a bag only after the seal works: A storage bag manages leaks but does not prevent them. Fix the lid first, then buy a bag sized to your largest container if you transport food. Skip the bag if your containers stay at home.
Rule 4: Run the price test before replacing: Compare the lid price against the price of a new container in the same size. If the glass is chipped or the container is rarely used, replacing the whole piece may be the better call. Check the rim for chips before ordering a lid.

Product facts

Rectangle Lids: Lid sizes correspond to the model number located on the bottom of your glass container (letters followed by the first three digits). The color of the lid and/or silicone gasket may vary. Gaskets are not available as a separate replacement part; the whole lid must be replaced. This is the part to buy when a seal fails, and the model code is the only reliable way to get the right size. Expect a possible color variation, which does not affect fit.
MHRB-270 Glasslock Handy Rectangle 11.5 cups: MHRB-270 Glasslock Handy Rectangle 11.5 cups, 2.88 qt, 9-1/8'' x 7-3/4'' x 4-1/2'' h. Not for use in oven. A large rectangle container for batch storage or carrying a full meal, but the oven restriction means it is for fridge, freezer, and microwave use only.
OCST-165 Glasslock Oven Safe Square 6.0 cups: OCST-165 Glasslock Oven Safe Square 6.0 cups, 1.5 qt, 7'' sq. x 3'' h. Oven-safe square container for reheating or baking, and the square footprint stacks efficiently in a cabinet.
OCST-090 Glasslock Oven Safe Square 3.3 cups: OCST-090 Glasslock Oven Safe Square 3.3 cups, 26.4 oz, 5-3/4'' sq. x 2-3/4'' h. A single-serving oven-safe square that is a practical size for lunch portions and small leftovers.

Who this is for

Best for

Owners of Glasslock containers with a cracked lid or failed seal who want to keep using the glass base.
Commuters who carry meals and want a correctly sized lid plus a leak buffer bag.
Shoppers replacing a single part rather than buying a whole new set.

Not for

Anyone hoping to buy silicone gaskets on their own, since Glasslock does not sell them separately.
Shoppers whose container glass is chipped at the rim, because a new lid will not seal it.
Buyers who want a lid to fit multiple container shapes, because lids are model-specific.