Carry everything you need and stay hydrated during your run with the lightweight Nathan VaporAir Lite 4L Hydration Vest. This hydration pack fits like it was tailored for you with Nathan’s Adaptive-Fit™ technology. There are two set-it-and-forget-it hook and loop panels to adjust it for your body type. The lightweight and breathable mesh and stretch woven materials provide comfort for you as you rack up the miles. This hydration vest comes equipped with a 2L bladder that has a quick release valve for all of your hydration needs. There are also seven total pockets, including front pockets that fit bottles or flasks up to 22 oz and back pockets for storing extra layers. The unisex Nathan VaporAir Lite 4L Hydration Vest is a lightweight and breathable vest that is perfect for race day.