Wean Green"s Snack Cubes tempered glass containers are the perfect size for every eco-chic family member. Try putting in a yogurt & granola mid morning snack or use them for your hungry 11 month old for their entire lunch serving! The leak proof silicone seals ensure no spills in your diaper bag or lunch bag. The seals are removable to ensure no bacteria build up. Lids are durable and have passed the "use" testing machine over 3 million times per tab! The child friendly design allows easy opening for small hands and the glass is 4-5 times stronger than a drinking glass! Snack Cubes are freezer, microwave, & dishwasher safe.