Do you just close the velcro strap on the flip flop, and then caribiner, via that strap to the pack? I was concerned that, with all the bouncing around, the velcro might come loose. There are also holes in the rubber that I could have put a caribiner thru, but I was concerned that would probably stretch out the holes....
What I did was this: The velcro strap is attached to each end of the shoe to a tiny metal triangle. I caribinered thru one of those metal triangles -- but it did end up pulling loose from the shoe.
Thanks!