This universal backpack strap clip allows you to design your own “peripherals” for your backpack. It has a groove ( see dimensions in the photos) that allow docking stuff to to the clip. There is also 3mm hole in the middle of the groove, if you need more secure docking mechanism. 

Origin Story

I wanted to take part in Printables Backpack -contest with a backpack strap container for bandaids. Unfortunately I didn't have time to finish it before the deadline, so I decided to participate with this universal clip that I designed for the bandaid container.

Print Settings & Tips

Print clip with it's side on the build plate. Hole has a teardrop shape, which should point up. 
Layer height: 0.1-0.5mm
No supports or raft needed.