Wean Green's Wean Tubs tempered glass containers help eliminate the need for harmful plastic food storage! The rectangular shape is great for storing snacks like carrot sticks and pretzels. With a 5oz capacity, the Wean Tubs are a great next step for baby food storage too! The leak proof silicone seals ensure that you can drop them in your bag with no spills. 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! Wean Tubs are freezer, microwave, & dishwasher safe.