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Item # USP1G201M

UltrAspire Big Bronco Running Vest Pack

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Built in collaboration with champion ultramarathoner Jeff Browning, the UltrAspire Big Bronco running vest has a 12-liter capacity, an apparel-like fit, and a versatile assortment of pockets that are perfect for long self-supported miles on the trail!


  • ErgoFit harness construction eliminates unwanted "bounce" and completely dials in fit
  • MaxO2 adjustable shock cord closure system on front harness is far less "fiddly" than other packs and provides excellent stability
  • On-The-Go pocket configuration: 4 stretch mesh harness pockets, 2 side stretch mesh pockets and 1 large back stretch pocket
  • Though neither bottles or a reservoir is included, the pack is capable of carrying up to a 2-liter hydration system and as many as 4 bottles (2 up front and 2 in innovative rear Fluidic Holsters)
  • UltrAcool light mesh for breathability
  • Durable and lightweight fabrics

How is it sized?
To ensure a proper fit, the Big Bronco is available in Small (best fits chest sizes of 35"-40"), Medium (38"-43"), and Large (43"-46") size options.

Technical Specs

Best Use
Panel loading
Fits Torso
Small: 35"-40" chest measurement (widest point)
Medium: 38"-43" chest measurement (widest point)
Large: 43"-46" chest measurement (widest point)
Hydration Compatible
Sternum Strap
Yes; adjustable
732 cu in
1-Year Limited
Running Vest Pack
Silicone and PU-coated nylon
Item Weight
7.2 oz

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