On a personal note I only carry smaller (HB,Bushboot, etc.) vertical due to shoulder problems. Horizontal carry is great with the small ones, but works just fine with the mid length blades, too. Most of these are being carried small of the back like Bud describes and work well. Needs to be a good tight profile fit regardless of size. For anything larger than a Sneaky Pete, I recommend a crossdraw style on the weak side. Easy to bring long blade out and back in while staying comfortable, even sitting. For what it's worth, I carried a 7" Randall in the small of my back through a tour and a half in country and was happy that it was there.