Summary

Removed stencil background and made it 3mm thick.

Removed charging hole on bottom of case and shortened the hole for the power button. This increases structural rigidity.

Added two 3mm thick loops on each side of the case. I was not able to break these loops off with my hands.

Instructions

Printed with ABS, 0.3mm layer height.
3mm brim, no raft.
I used pillar supports to print this. Most likely not needed, but it doesn't hurt.

If you are printing this with ABS, I would advise you wipe down the case with acetone to increase the strength of the case. The acetone will dissolve the acetone and cause it to stick to the other layers very well.
I took a cutip and wiped down the corners really well so it doesn't snap there.

Using a lanyiard, or a small rope you tie it around both of the loops. Then you put two loops in the rope: One that is far away(approximately two or three feet) and one that is close(3-6inches). Attach carabiner to the two loops and you are ready to go.

The close carabiner should be attached when you are actually climbing, and the one farther away is for when you want to take a picture. This allows you to keep the phone connected to you at all times.

iPhone 5 Rock Climbing Case