The White River Knives Website now has an Accessories page where you'll find the newest Kydex Sheath design for the Backpacker and Caper knife models - introduced at Blade Show 2017. The sheath is contoured to accentuate the blade profile and comes with belt loop attachment and fasteners, plus paracord neck lanyard with safety breakaway clasp.
I like the sheath. A possible suggestion is to take a look at the kydex sheaths that Bob Dozier produces for his knives. You don't need to remove or loosen your belt to wear them; just clip them on. Really handy for cross draw. By the way, I love the Backpacker Pro.