The Distance 4L Hydration Vest is a lightweight pack designed for long-distance races and fast adventures. It features a harness with soft stretch edges for comfort and freedom of movement, high-stretch side panels to reduce bounce and improve fit, and dual flask pockets holding two included SoftFlasks for hydration. The vest includes an over-the-shoulder carry system for trekking poles and multiple pockets for organized storage. Its lighter color options increase visibility and help with temperature regulation.