Safety razor: When you need to shave with a razor, these things work better than disposables and are cheap as hell to replace the blades for. Still on my original pack of blades from 10 years ago (got a gross of blades for maybe $20) and am not even halfway through - I might not ever have to buy blades again.
I love my poncho liner lol, it’s perfect for a hammock blanket. I think it was maybe $5.