The Nathan Vapor Air 3.0 7L vests are the next generation of the award-winning Vaporair / Airère series. By incorporating new materials, hardware, and pocket design, these new vapor vests are our best version yet. Notable updates include newly exposed air mesh shoulder straps, colored elastic cords on the front shoulders and rear center panel for additional storage options, low-profile hardware on the sternum straps, and the new rear zipper pocket that is easier to access while on the run. The adaptive fit adjustable sizing system provides a custom and body-mapped fit ideal for most body types with a newly added extended size of 1XL - 3XL Two storage pockets near the adaptive fit straps - one on each side | New 2-layer moisture-wicking air mesh on the straps and rear interior for maximum breathability and comfort Breathable and chafe-free for maximum comfort Equipped with a 2L bladder with a quick-release valve Secure front shoulder zipper pockets Front pockets fit bottles and flasks up to 22 ozChimney vented back panel construction for maximum airflow.Extended kangaroo pocket for more storage | Reflective hits for 360-degree visibilityStorage capacity: 7 liters - 427 Cu, Weight with bladder: 13oz / 376g, Weight without bladder: 8.8 oz / 227g, 60% nylon, 40% polyester Nathan Vapor Air 3.0 7L - Hydration backpack | Hardloop