MADE FROM PREMIUM GRADE GLASS: Proven to reliably maintain structural integrity when exposed to high or low thermal conditions, Boroscilicate glass endures hot & cold temperatures due to freezing & heating. FREEZER, MICROWAVE & OVEN SAFE: Our clear glass food storage dishes are microwave safe, fridge-safe, freezer-friendly. Lids feature vents that release steam. Put warm or hot food straight in the freezer without worry. LEAK PROOF 4 WAY SNAP DOWN LIDS: Each bundle set of food storage glass containers includes locking lids upgraded with tight seal leak-resistant silicone rings. No leaking. Perfect pick for packed school or work lunch. EASY TO CLEAN, NO ODOR OR STAINS: Unlike plastic food storage containers, our strong glass food prep containers don't absorb odors or succumb to yucky staining. Storage containers & lids are also conveniently dishwasher-safe. 100% NONTOXIC, ECO-FRIENDLY, SAFE: Use boxes to pack snacks, lunches, leftovers. #1 eco safe choice for meal prepping, dieting, keeping kitchen organized. Glasswares by Waterside Fine China are available in a variety of combos.