Leave no trace

Camping in a pristine area is the ultimate Leave No Trace challenge because it is imperative that you literally leave no trace—and that is very hard to do.

These fences catch any MOOP (“matter out of place”) that blows out of peoples' camps, where it can be harvested and packed out—leave no trace—and all that.

"Although people don't think it, the traveller ethos at free festivals was "leave no trace"—you went there, you had a party you cleaned up.