UltrAspire Big Bronco Race Vest Desert Sage – Lightweight 12L Pack with 2 SoftFlasks Included

Meet the Big Bronco: a high-performance race vest built for long days on the move

The UltrAspire Big Bronco Race Vest is designed in collaboration with ultramarathoner Jeff Browning, bringing together precision fit and durable construction for demanding runs. The focus is on enabling natural movement, stable weight distribution, and quick access to hydration while you stay focused on pace and terrain.

Design, fit, and moveability

ErgoFit combines thoughtful geometry with responsive materials so your pack contours with your body. The front harness hosts four pockets crafted from four-way stretch mesh, keeping essentials within easy reach. With a total capacity of 12 liters and the option to carry a 2 liter reservoir, you can tailor storage to your route and gear needs while maintaining close contact with your core.

• ErgoFit supports precise movement and weight distribution
• Front harness pockets use four-way stretch mesh for flexible storage
• 12L capacity with reservoir compatibility for hydration versatility
• Multiple bottle options compatible with the front pockets (not included)

Cooling comfort and quick access

The back panel features UltrAcool Light Mesh to minimize heat when fully loaded. A soft foam flare guides your hands into the rear entry, and a sweat-proof pocket helps protect valuables during intense efforts.

• UltrAcool Light Mesh enhances airflow along the back
• Soft foam flare improves back-entry access
• Sweat-proof pocket adds secure storage
• Breathable materials designed to stay comfortable over long sessions

Hydration options and included fuels

The Big Bronco is hydration-ready with a 12L shell, front pockets, and compatibility for a 2 L reservoir. It ships with two 500 mL SoftFlasks, offering quick sipping on the move and flexibility for different bottle setups.

• 12L capacity with reservoir compatibility for extended outings
• Front pockets support several hydration configurations
• Included: two 500 mL SoftFlasks for fast on-the-go sipping

Breathability and stability in action

Max O2 Form uses a controlled shock cord with ample stretch to support unrestricted breathing while keeping the pack stable as pace picks up. The system is patent-pending and designed to work with varied exertion levels without compromising fit.

Whether you’re running a trail loop, chasing distance, or tackling heat with a desert-sage palette, the Big Bronco offers options that may help you stay comfortable and focused through the miles.