I would argue the plumbing system beneath and behind you is more useful.
Arguably. Though I could just use a hole in the ground. I'd say the sink is a close second. If I was in the wilderness and I needed to choose one though, I'd choose the toilet paper.
My job occasionally takes me out into middle of nowhere unmanned industrial facilities. I keep a roll of toilet paper in a plastic coffee can, because these facilities usually don't have facilities.
Toilet paper
I would argue the plumbing system beneath and behind you is more useful.
Arguably. Though I could just use a hole in the ground. I'd say the sink is a close second. If I was in the wilderness and I needed to choose one though, I'd choose the toilet paper.
My job occasionally takes me out into middle of nowhere unmanned industrial facilities. I keep a roll of toilet paper in a plastic coffee can, because these facilities usually don't have facilities.