The Vapor Air and Airess 3.0 7L vests are the new generation of the award-winning VaporAir/Airess series. By incorporating new materials, hardware, and pocket design, these new Vapor vests are our best version to date. Notable updates include newly exposed breathable mesh shoulder straps, colorful elastic cords on the front shoulders and the center back panel for additional storage options, discreet hardware on the chest straps, and a new rear zippered pocket that is easier to access when you're on the move. • The women's specific Adaptive-Fit waist system offers a customized fit suitable for most female body types with a new expanded size range from 1XL to 3XL• Two storage pockets near the Adaptive Fit straps - one on each side• New 2-layer moisture-wicking air mesh on the shoulder straps and inside the back for maximum breathability and comfort• Breathable, chafe-free binding for maximum comfort• Equipped with a 2L bladder with quick-release valve• Secure front zippered pockets on the shoulders• Front pockets accommodate bottles and flasks up to 22 oz• Contoured chimney back panel construction for maximum airflow.• Extended kangaroo pocket for additional storage | Reflective touches for 360-degree visibility• Storage capacity: 7 liters - 427 Cu. In.• Weight with bladder: 13 oz / 376 g• Weight without bladder: 8.8 oz / 227 g Nathan Vapor Airess 3.0 7L - Hydration backpack | Hardloop