Our Spike Camp Duffel integrates perfectly with the "Just One" backpack. Carry it internally to protect your gear inside the utility compartment. Or you can either zip or clip it onto the outside to convert the Just One to a 7000 cubic inch pack. You’ll find that the Just One is the most versatile pack you’ve ever owned, and the Spike Camp Duffel will make it even better. Load it with your clothes and sundries, then drop it into your pack. When you reach camp, slip out the Spike Camp 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, put your gear outboard in the Spike Camp Duffel, and head off the mountain.