The Reusable Fresh Snack Pack comes in a sandwich size and a snack size. A built-in placemat for both sizes makes lunch easy to eat whether at the school cafeteria, office or park. There is no cross contamination because of the unique double wrap closure, this means that your placemat is always clean. The snack size has side gussets to accommodate bulky snacks like whole strawberries or apple wedges. Clearly see your lunch through the bags for easy identification. They are ultra durable, easy-to-clean plastic. We have stopped counting after reaching 100 days of school and still using and reusing the same sandwich bag. It will be an easy transition from disposables to the Fresh Snack Pack and just think of the peace of mind in knowing that you won't be throwing countless, flimsy baggies in the trash. Dimensions for the sandwich size: 6-inch by 8-inch when closed; 17.5-inch by 8-inch when opened flat. Dimensions for Snack Size: 4-inch by 6-inch when closed; 12-inch by 6-inch when opened flat. Material: made of