Whoa, please help out the acronym challenged...If anyone has tried HBN on leather, it is STOS. I don't know how the leather would be if it got wet, but the HBN doesn't care.
http://www.lowerfriction.com/What's a good source for some Hexagonal Boron Nitride?
I would be good with WS2 on my bullets, but not on my bags.