Bronco Lightweight Running Race Vest 5L

Built for ultramarathon athletes who need to move fast and carry everything, the Bronco is our pick for runners tackling long-distance races and training runs in punishing heat. The MaxO2 Form closure locks the vest down with a single pull so it breathes and rides stable no matter your pace. Seven on-the-go pockets and UltrAcool mesh keep you organized and cool when it counts.

• 5L total capacity with 7 accessible on-the-go pockets — fits a 1L reservoir plus front bottles, snacks, and gear without slowing your access
• Patent-pending MaxO2 Form closure uses shock cord that stretches for unrestricted breathing and rebounds to keep the pack locked in place at speed
• Front harness has 4 stretch mesh pockets compatible with UltraFlask 550, Formula 250, Human 20 oz 2.0, 1L Reservoir 2.0, or a collapsible bottle (none included)
• UltrAcool Light Mesh back panel pulls sweat away and reduces hotspots when the vest is fully loaded — critical during long efforts in Southern heat and humidity
• Available in Small (30"–36"), Medium (32"–38"), and Large (34"–42") in Pitch Black/Red — co-designed with champion ultramarathoner Jeff Browning for real-race ergonomics