Pack it in, pack it out

Pack it In, Pack it Out (variably "Carry in, Carry out") is a waste management philosophy of environmentalism that states whatsoever a person brings into a natural area must be taken out of the area when the person leaves.

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The idea is to remove all forms of litter and biodegradable waste from the natural area for proper disposal so that the materials will cause no harm to the natural resources of the ecosystem. The philosophy is an integral point of the Minimal impact code and is typically practiced by environmentalists, naturalists, and conservationists who partake in camping, hiking, trekking, fishing, and other activities that involve entering wilderness areas.