Poseidon's Towel of Choice
I've found this thing invaluable while traveling/backpacking. It absorbs an absurd amount of water and dries very quickly (can go from soaking wet to usably dry in about an hour if you hang it up). I use the L size and its more than enough to completely dry me off after a shower or an impromptu dip in a river. I've never noticed it holding a smell, but I usually wash it after every few uses. The included storage sack seems pointless, I'm not sure why you wouldn't just ball it up or fold it and stick it in your pack.