You've got a friend who's always going camping. He tells you that he's going "off the grid" for two weeks in the summer and you can't imagine not having air conditioning for two minutes, let alone two weeks. Whatever. We're all different, just like snowflakes.
The thing about camping and hiking and all that physical, outdoorsy activity is that you get sweaty, and muddy, and dusty, and smelly. All of the clothes that you bring have to fit in your backpack, so the only option your outdoorsy friend has is to wear those gross clothes or, I don't know, wash them in a stream and beat them against a rock like crazy hill people do (sounds like an awesome vacation).
NOT ANYMORE, though. Enter the Scrubba Wash Bag ($60). All your friend has to do is add water, some soap, close the bag, rub it for a few minutes, rinse and rub again, and then hang to try on a nearby tree branch or some shit. This produces the cleanest clothes you're going to get when you're in the middle of the wilderness, making it the best gift your outdoorsy friend will ever receive. It might even help him convince his girlfriend to go camping with him.