The Blue Widow was introduced upon the request of bow hunters who had wondered at first glance what they would do with the rifle scabbard on our Dragonfly and Just one pack. Similar to the Just One and Dragonfly packs, the JP9 has a wide range of configurations. The basic pack capacity runs from about 2200 cubic inches (including the removable fanny pack) to about 4700 cubic inches. Add a Spike Camp Duffel to the outside and it grows to 7200 cubic inches; add a Super Spike Duffel and it grows to 7600 cubic inches. The pack's patented Cam Expansion feature and unique features such as the 4-way compression straps and Flex Chassis give it outstanding performance in every configuration -- so you can use it as a compact, close riding daypack, or as a full-scale freighter, or anything in between. Most packs will only do one of these things, and the Blue Widow is designed to outclass them all, whether daypack or freighter.Eberlestock Commercial