This YKK MOLLE buckle can easily fasten CELL phone bag and attach it to shoulder straps of backpacks. (It is compatible with webbing on shoulder straps no wider than 1.5 inches.)
This would provide extra stability while moving fast, especially suitable for hikers on the trail.
Step 1: Fasten the MOLLE buckle onto CELL bag
Step 2: Clip through the webbing on your backpack's shoulder strap
Step 3: Complete the set up and ready to go