These Kraft Heat Seal sandwich packs are designed to extend shelf-life of the product within. An attractive Kraft board sandwich box to hold one filled sandwich cut in half. The top can be heat sealed to the body to retain the maximum freshness which can be 3+ days, depending on the filling. The pack has a natural kraft exterior with a white interior, with a special grease resistant coating which, again, is dependent on the filling so should be tested first. The clear plastic window lets potential customers clearly see the product they are buying. Heat sealing machinery is required to heat seal the box. Delivered flat to save on storage.