Customizable Backpack Strap Clip

This is a customizable strap clip for backpacks. The design is mostly based on [mattbeechan's](http://www.thingiverse.com/mattbeechan/) [Seal Line Strap Clip V3](http://www.thingiverse.com/thing:307347).

You can specify most (if not all relevant) parameters, including

* buckle width
* strap width
* strap thickness
* opening sizes and positions
* material thickness

The model allows to clip two different straps together.

All files can also be found on [Github](https://github.com/sp