New big bronco unisex running/ racing hydration vest with bottles. Message me for bundles and offers:) size is a unisex small (fits like a men’s small, women’s small-medium) The Big Bronco Race Vest is a 12 liter pack built in collaboration with UltrAspire Elite Athlete and champion ultramarathoner Jeff Browning. The Big Bronco is designed to highlight all of the features of the Bronco race vest but with expanded capacity and accessibility. This vest has a total of 7 accessible pockets on the go, and is capable of carrying 4 bottles and a 2 liter reservoir.