Always carry a few heavy duty contractor bags Ive been told, or in Australia drum liners as I found out after three hours of searching the internet. Clear colored ones can also be used for water transpiration from foliage and are food grade.

shelter – poncho, tarp, ground cloth, insulation for bedding

carrying

water proofing

water gathering ,rain catchment

flotation device

food hanging bag

emergency booties for water crossings

stretcher for evacs

Transpiration of foliage

Supported bed from an A-frame

https://www.survivalsuppliesaustralia.com.au/Heavy-Duty-Poly-Bags-Drum-Liners-250-Litre-0.15mm-Thick?b7=z1