The outer material is usually pure pulp kraft paper, kraft paper can be divided into white kraft paper and yellow kraft paper. Part of the window kraft paper outer layer will be double subfilm, which makes it waterproof, for example, in some frosted window kraft paper products have this design.
In order to moisture-proof, the inner layer is often coated, like the kraft paper products with transparent Windows, and the inner layer of the coating can play a good moisture-proof effect

New Style - 50 Count of 12 Oz Flat Bottom Box Pouch Bag with Valve and Zipper
Hold 12 oz of ground Coffee
Size :[H x W x Gusset]: 7-7/8 in X 5 in x 3-1/8 in
Package Dimensions: 14.76 x 12.24 x 3.46 inches
Item Weight: 1.7 pounds

Two layer:NY/PE,PET/PE,etc.
Three Layer:PET/AL/PE,PET/PET/PE,PET/NY/PE, PET/VMPET/PE,etc.
Four Layer: PET/AL/NY/PE,PET/AL/PET/PE,etc.
Design:free design or by customer's artwork
Printing:Gravure printing
Packing:solf string + PE bag + 5 layer carton + packing belt + wooden or plastic pallet