How to use shoulder backpack correctly

- May 20, 2019-

Specific methods of operation:
First step: Hold the adjustable strap under the shoulder strap latch with both hands clenched.
The second step: Pull the adjustable strap back to the bottom.
The third step: Always tighten the adjustable strap until the root of the backpack.
Step fourth: The trend, has completed the standard normative action of the backpack.