GoPro Hiking Backpack Shoulder Strap Mount

So a couple of friends are on their way to Base Camp in Nepal, its a trip of a lifetime! Unfortunately they don't have an awesome camera to take photos, So I offered up my GoPro! Problem is, where do you put it? So I grabbed my trusty calipers and measured up the shoulder straps on one of their backpack and came up with this! No complicated moving parts, simple and durable.. hopefully.. guess I'll find out if it survived when they get back?

UPDATE! It survived the trip and I made a video about it here! -
https://www.youtube.com/watch?v=w0rrvOhlXhc&lc=z23mwvszvte3yn0caacdp43bbt25byhorvttmcn5bwpw03c010c