Just interested to hear about what people consider their single favorite piece of gear. Mine is the Sea to Summit back country shower. It's essentially a waterproof stuff sack with a twist shower nozzle on the bottom of it. You can fill it with water, lay it on a rock and in three hours you will have a warm shower. It packs down to absolutely nothing. But I mostly use it in camp to easily distribute water for washing my hands, doing dishes and cleaning up around the camp . I do some guiding as well and it's very handy for that.