Backpack Zipper Requirements

- Apr 06, 2017-

Want to take a trip line, and then press the line, a total of 2 lines. Single needle from the material edge 3mm, double needle spacing 6mm.

All zippers to go 2 lines, but the cloth has shown a trip, but also shows two times.

B. Zipper up and down to be generally long, can not have wrinkles.

C. If the zipper has a pull head, open it from left to right.