Open window is a good way to show your product even it is packed into a box.  Instead of just an opening, a sheet of Acetate can be glued to the window.  Both PVC and PET is available.

Features Specifications:Printed Box with Open Window
1) Dimensions:Customized Sizes are Accepted.Paper Bag Size Description
2) Printing: 4c
3) Material: 300gsm one side coated paper glue on corrugated paper (CE)+transparent PET film
4) Surface treatment: gloss (PP)/matte lamination
5) To show product inside
6) Not necessary to open the box before purchase. Reduce Damage to your packaging.
7) According to the designs by clients, we can produce all kinds of shapes, colors of product