Ever been camping without a shower?
Ever been told that to have a shower, you put a bag over your head and hose down in the middle of the camp area? Camping joke - you can't see who is watching! This is a proper camp shower! Just put water in the bag, and warm it up in the sunshine.

Bonus: Doubles as a puzzle on how to put this away. (cheat-sheet on the bag).

Double Bonus: No-one will complain that you smell that day!