Lots of beaches and campsites have outdoor showers, but if you go slightly off the beaten path, sand, salt, and dirt become your close friends. You can currently buy contraptions that have a bladder or tank and a hose that create a makeshift shower, but they require you to carry or have access to fresh water to fill the tank. What about a new version that includes a filter? The user can carry it in its collapsed state and then fill the tank with sea water (or other dirty/unfresh water) and still achieve the lovely feeling of rinsing with sweet, clean water.

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