"Nathan® Hypernight Quick Start 2.0 4L: The Nathan® Hypernight Quick Start 2.0 4L is a lightweight hydration vest built for runners who want hands-free hydration and secure storage without excess bulk. It carries a 4L capacity and includes a 1.5L hydration bladder, making it practical for training runs, long runs, and low-light efforts where staying hydrated and visible both matter. Geo-reflective print across the vest increases visibility in dim conditions, giving early morning and evening runners a meaningful safety advantage. At just 7.2oz without the bladder and 12.4oz with it, the vest keeps your overall load light during daily training.A front bottle pocket fits flasks up to 22oz within easy reach, while front storage accommodates most large-format smartphones and nutrition. The main back zipper pocket adds dedicated space for additional gear. Adjustable front and side straps let you dial in the fit to prevent shifting, and soft perimeter binding reduces friction during longer efforts. One size fits most, making it accessible for a wide range of runners. This combination of practical storage, lightweight construction, and secure fit makes the Hypernight Quick Start 2.0 4L a straightforward choice for runners who prioritize staying hydrated and visible without carrying unnecessary weight.Why Our Fit Experts Love It""I wore the Hypernight Quick Start 2.0 4L on an early morning run before sunrise, and the geo-reflective print was immediately noticeable in headlights. The adjustable straps kept the vest from shifting, and having the front bottle pocket within reach meant I never had to stop to hydrate."" - Sean, Road Runner Sports Fit Expert, Chula Vista, CAWho It's Best ForThe Nathan® Hypernight Quick Start 2.0 4L is best for runners who want a minimalist hydration vest with enough storage for essentials without the bulk of a larger pack. It suits runners logging early morning or evening miles, trail runners, and anyone who prefers hands-free hydration during daily training and longer efforts. If you need quick access to water and fuel while staying visible in low-light conditions, this vest delivers the right balance of capacity and portability. VIP Family members can take the Hypernight Quick Start 2.0 4L for a 90-Day test drive with our Perfect Fit Guarantee."