Wean Green's Lunch Cubes tempered glass containers are perfect for lunch on the run, pack an entire lunch for everyone in the family! The square Lunch Cube holds as much as the frozen meals from the grocery store but you can pack them with your own fresh, healthy, organic foods. 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! Lunch Cubes are freezer, microwave, & dishwasher safe.