A set of folding cutting boards. Chop flat, then fold the board into a chute and pour the contents where they are going.

The usual camp problem is that there is no counter, so you chop on a board balanced on a tailgate and then try to scrape onions into a pan with a knife. Folding the board solves that in one movement.

They store flat and clean up in a camp sink. Having two means raw meat and vegetables stay on separate boards, which matters more in camp than at home.