I've carried a funnel (special made for above situations;not the random kitchen funnel *g*) while hiking. I've never used it because I sometimes under-hydrate when I'm being stupid and young in order not to use it, but I can definitely see where it'd come in handy. If you are hiking on a trail above the tree line and the trail is well traveled and there is no where to pee except off the side of the mountain and option to avoid dropping and squatting is very, very welcome.