The power pack was made from a block of wood; sanded and Dremeled with the design. Then d-rings placed on either side and a leather strap. I used the same woodgraining technique that I used on my blaster. The hose is a simple 1/4" car vacuum hose. I used the metalizing technique on the hose. You can check out the woodgraining and metalizing tutorials at the above link.
You can check out an awesome power pack tutorial here: