Because backpacks, etc. really make me perspire and I usually travel in the summer, I wear a fanny pack because I try to carry as little as possible and I hate being burdened with a purse. I usually only carry my Key to the Kingdom, money, id, a 3 X 5 index card with ADRs , etc., a sweatband, trial size bottle of suntan lotion. Everything else, mostly water, I either buy or take a bottle holder that I can attach to my fanny pack.