Load the Super Spike Duffel with your clothes and sundries, then drop it into your pack. When you reach camp, slip out the duffel and set it in your tent. Put your pack into its compact mode, and you'll be ready for adventure. Once you've bagged game, load the meat inside the meat compartment of your pack then zip or clip on the duffel and put your gear outboard. It provides direct access while mounted to the pack, features two internal tuck-pockets, a carry strap and is made from the same NT1 fabric as the backpacks. With the Super Spike mounted to the outside, your Just One will grow to over 8000 cubic inches. The Super Spike Duffel is "zip-on" compatible with Just One backpacks manufactured in 2005 and forward. 1lb 4oz. Advantage Max 1