Strap lock for bags

This strap lock will properly be the strongest part of your bag. Print it, and then you can hammer in two 36mm M3 rods in the holes. The holes also forces your slicer to make proper shells (see last pic). Without the rods, this design is still strong enough for most applications.

There are two versions of the design, a simple one for redesigns and an ergonomic one for printing.