This mighty little chest pack keeps things simple without compromising functionality or comfort. Comfort is the most common failure of chest packs resulting from the simple, loop neck strap that always ends up digging in. Umpqua's four-point back panel (connects over both shoulders and sides) provides all-day comfort and allows for d-ring net attachment. Umpqua's new Zero Sweep‰ă˘ design is particularly useful in this pack because its streamlined/imbedded functionality take up less space. Two Zero Sweep‰ă˘ retractor stations, a Zero Sweep‰ă˘ tool sheath and Zero Sweep‰ă˘ foam fly patch and a cord tippet holder round out this mighty little pack. Also integrates with both Overlook ZS back panels/compartments and the Surveyor 2000 ZS Backpack (both sold separately). This kit includes both the Rock Creek ZS Harness and the Rock Creek ZS 550 Back Compartment. The Rock Creek ZS Harness has four point shoulder staps with a strap harness (no storage). The Rock Creek ZS 550 Back Compartment is hydration compatable and adds 550 cubic inches (9 liters) of compartment space that holds 4 large fly boxes and then some.