Military Harness Backpack. This High-performance tactical training military harness features adjustable buckles to provide superior comfort for your dog and a side pocket for treats or other items. The backpack is detachable and looks great if you want to use it just as a harness. The Military harness backpack is waterproof and made from Codura fabric which makes it perfect for all seasons. It features an aluminum Alloy D ring and nylon webbing. The Backpack harness is easy to take on and off.