I'm going to an area in a few weeks that guarantees several knee high creek crossings, so I wanted something that would protect my feet from rocks and sticks, and maybe serve as a camp shoe at the end of the day. These look like they'll fit the bill pretty well. With a claimed weight of 3.4oz for the pair I think I can manage. They are constructed of neoprene, with either rubber or silicone bumps on the bottom for traction. They can be stored completely flat, something I haven't seen any other sandals do. Unlike plop-plops these stay secure to the wearers heal, and I've never seen flip flops this light. Pretty cheap, too.

I bought mine here. http://www.gofastandlight.com/Walk-On-Small-Mauve-The-One-Piece-Camp-Slipper-Shoe/productinfo/CL%2DFLOP/

Company website: http://www.flopeeze.com