On my recent trip to the Wind Rivers I twice saw people using these. At Marms lake I saw a guy fishing out of one and then from the Midsummer Dome I could see what appeared to be two on Pyramid Lake. Marms is only about 7 miles in but Pyramid is a good 12 miles from the TH.
I can't imagine carrying something like that into the backcountry. Wondered if anybody was familiar with these lightweight boats.