I've been working and reworking my PSK for two winters now. First, I used a 4015 military surplus canteen/utility pouch with a Vietnam era metal canteen cup as a container for my kit. When I field tested it, I put it on a black nylon web belt and carried it on my waist. It worked pretty well when I only had a vest on, but when I put on a field jacket, it didn't fit comfortably under the jacket, and over the jacket blocks all of the pockets and the game bag. I then downsized to a 7x5x2 mil-spec pouch on the same belt. It fits, and I can squeeze the essentials in there, but I had to downsize to a much smaller steel sierra cup. Canteen cup vs. Sierra cup; what say you all?