Lets post everything you know about leathercrafting here.

Leather straps - Salvage into rawhide leather scraps
Drops from any centaur.

1 pile of glistening powder 10 stretched rawhide leather = 8 slot oiled bag (takes priority over junk items)

1 bolt of jute and 2 stretched rawhide leather = Rune of healing (+20hp bonus to armor)