The Sandwich boxes keep the Sandwich fresh through unique locking mechanism , transparent window can better display the food inside。 The flat packed of Sandwich boxes for delivery helps save space and delivery cost. The Sandwich box is perfect choice for the convenience store , coffee shops ,drive-through window, snack bar, supermarkets and so on . PE and PLA window are available . Our Sandwich Boxes are completeley compostable and biodegradable if you choose PLA window ,there is no any lining inside .