[Freak_NL]

I am positively surprised to learn that a product called 'Butt Paste' exists.

Still seems that economically speaking it might be cheaper to create such a backpack from a more suitable cloth instead.

[randlet]

How about Anti-Monkey-Butt-Powder? [1] Popular in motorcycling communities.

[1] http://www.antimonkeybutt.com/

[Poiesis]

It exists, and it is wonderful. Hands down the best stuff for diaper rash I've ever used.