Longus bicycle tail light replacement clip (variants)

The original clip for my tail light broke off so I designed a replacement part. 

It worked just like the original but it tend to fall off from my deuter backpack. 

I designed a slightly modified version with a bigger hook and a notch that prevents it from unhooking. 

I also designed a version with a wider gap so it can fit a thicker base like a zipper. 

Printing requires supports and it is crucial to orient it on its side. So the layer lines go around a clip giving it the necessary strength at the stress point.

All three versions fit the original bicycle attachment.