To sort of answer your question, we have some interesting desert locations that we visit in the back country where the lack of rain prohibits the breakdown of materials. We have never seen another person in these locations from the difficulty getting through the landscape and the absolute lack of water sources but we always pack out paper products like TP and wet wipes. Animals will dig them up and spread them. Place in a ziplock freezer bag and keep in a pocket on the outside of the pack. Throw in first trash can you encounter after coming back into civilization. There are places that require wag bags but we don’t go where other people go so I’m not much help for that.