The Nathan Synergy Race Vest is designed for the runs, rides, and hikes when you need the best in hydration.

Finally, the ability to carry water and electrolyte drinks in one bladder. The unique Synergy Bladder carries water and electrolyte/energy drink in separate chambers, and the Potency Dial allows you to choose all water, all electrolyte drink, or a combination of the two. Potency Dial easily and securely clips to either right or left shoulder strap at reinforced attachment points.

100 oz (almost three liters) Synergy Bladder with Potency Dial and bite valve with on/off settings. Electrolyte chamber has a roll-top closure that allows full access for easy cleaning and mixing. Water chamber has filter-compatible screw-top.

2-way Propulsion Harness has a stretch rubber device that lets the harness stretch and move with you, yet provides excellent stability.

Dual front pockets on the shoulder straps - one mesh holster, one zippered – provide quick access to small items like food or electronics. Two forward slanted mesh side pockets are ideal for water bottles or food.

Zippered main compartment has 750 cubic inch gear capacity, and hydration sleeve, bladder hangers and hydration port. Smaller zippered compartment inside provides increased gear organization.

Stretch mesh back pocket is great for stashing a jacket or gloves. Honeycomb mesh shoulder straps and back panel add comfort, prevent chafing, and dissipate heat. Vertically adjustable sternum strap has a tube clip.

Lightweight, breathable Wall Mesh with soft perimeter binding feels great against skin and won’t damage technical apparel.

Weights
Without Bladder: 1 lb 1 oz / 482g
With Bladder: 1 lb 9.9 oz / 734g

Unrestricted Innovation
Simply put, the Propulsion Harness­™ (patent pending) moves with you, not against you. Unlike traditional shoulder straps, the Propulsion Harness works in harmony with the back and forth movement of your shoulders and upper torso, preventing the pack from "riding up" or swaying back and forth. And thank to two inches of frictionless travel, from 2-way configuration, each shoulder strap moves independently, offering unmatched freedom of movement without reducing pack stability.