Since the first iteration of the Zygos, tens of thousands of runners have utilized this high-capacity 14 liter race vest. The lightweight and comfortable wrap around design complimented by the ErgoFit Harness ensures the Zygos 5.0 will be stable, comfortable, and hindrance free. The pack&&';;s MaxO2 Form adjustable closure system secures and adapts to the pack&&';;s load. This innovative system can conform the pack to the body using a single pull. Similar to the MaxO2 Sternum, this system allows the pack to remain secured without impeding natural breathing. Featuring 8 on-the-go pockets there are 2 zippered shoulder pockets, a dual 4-way stretch mesh pocket, a pair of stretch mesh pockets (one of which is zippered and suitable for carrying a large cell phone), a zippered side pocket, and a magnetically closed side pocket. The main back compartment has been reinforced at the stress points with XT fabric which contains stronger than steel ripstop fibers. This pack includes a 2-liter reservoir that fits into the removable insulated bladder compartment. Available in 3 sizes to ensure a perfect fit. Store co-owner Todd Vogel has used his Zygos on more than a dozen 100 mile races and also for his 8th place finish at the 2019 Tahoe 200.