ghdudley (USA)
Wipe out
Most sunscreens and insect repellants are either spray-on or rub-on from a glob in your hand or on your body. How about a towelette -- a la Wet Ones -- that have the sunscreen or insect repellant in them? It should be easier to get good coverage (and thus be less wasteful) and it should be less messy.

Reward: Knowing that it would make somebody's life easier.

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