Reusable Silicone Sandwich Bag Walmart.com Reusable Silicone Sandwich Bag 8 Colors ZeroWasteStore.com REUSABLE Sandwich Bag DIY Reusable Sandwich Bag Tutorial Reusable Sandwich Bag Reusable Sandwich & Snack Bags Shop Now. This environmental friendly sandwhich snack bag use natural organic cotton fabric in the manufacturing process in order to be completely reusable, durable, and provide antibacterial effects. Inner layer is made out of Food Grade Material that is resistant to water and oil for up to 4 hours. This perfect size of 18cm x 19cm is great option if you dont want to use ziplock plastic bag to takeaway bread, sandwich, snacks, even fried food. Best thing about the snack bag is the cute, fun designs. Contribute in less plastic waste never been so FUN for your children. How to use: Hand wash with cool water or wipe over with a cloth. Air dry and fold to store. Not suitable for Microwave Dishwasher.