Whether you're tackling a local 10km or grinding through a 70km ultra, the AMBITION 4.5L gives you unmatched freedom of movement and fast access to your kit.

Weighing in at just 190g, the vest offers a smart 4.5L capacity, strategically divided into front and rear pockets to ensure intuitive access on the move. Hydration, nutrition, emergency gear, and layers all have their place, thanks to the thoughtful layout and high-sitting fit. Every component is designed to minimise bounce and maximise comfort, so you can stay focused on the trail, not your gear.

Its breathable honeycomb mesh construction enhances airflow, keeping you cool even during hot, high-output sessions. The adjustable sternum straps and elastic side lacing system ensure a custom fit for all body types, while maintaining full freedom of breathing and motion. Multiple pole-carrying options let you adapt to race demands or terrain changes with ease.

Whether you're a seasoned ultra-runner or just building up to long days out, the AMBITION 4.5L delivers a balance of efficiency, reliability, and comfort. It's a vest built for athletes who demand performance, but won’t compromise on practicality.

The Instinct AMBITION 4.5L works by combining precision fit with ergonomic storage. The custom lacing and strap system creates a stable, body-hugging fit that moves with you, eliminating bounce and preserving breathability. High-sitting design positions essentials like hydration bottles and nutrition close to hand, so you can refuel without breaking stride. Each pocket is placed for natural reach and maximum usability, whether you're mid-race or adjusting gear on a training run.

Its structure uses a lightweight but durable honeycomb mesh that promotes airflow, reducing sweat build-up during high-output efforts. With front bottle holders, rear storage for kit, and multiple ways to carry poles, the AMBITION adapts to your specific needs for distance, weather, and terrain. Every detail is designed to reduce faff and keep you focused on performance.