OXO Good Grips 2 Cup Smart Seal Leakproof Glass Round Food Storage Container Four locking tabs secure the foolproof, leakproof lids Durable borosilicate glass containers designed to go from freezer to oven Smart Seal glass containers nest and stack for convenient and compact storage Lids are interchangeable between the same size glass and plastic Smart Seal containers Removable silicone seal is easy to clean Oven, microwave, freezer, and dishwasher safe Borosilicate glass is naturally BPA free and stainproof The OXO Better Guarantee: If you experience an issue with your OXO product, get in touch with us for a repair or replacement. We're grateful for the opportunity to learn from your experience, and we'll make it better