The Vapor Air and Airess 3.0 7L vests are the next generation in the award-winning VaporAir/Airess 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, colorful bungee cords on front shoulders and back center panel for additional storage options, low profile hardware on sternum straps and new back zipper pocket that is easier to access when you're on the run. Materials: 60% Nylon / 40% Polyester Weight w/o bladder: 8.8oz; Weight with bladder: 13.0oz Capacity: 7L – 427 cu in Care Instructions: Hand wash only - Nathan Power Wash Recommended. To clean bladder remove tubing, rinse tubing and bite valve. Turn bladder inside out and rinse dry standing up.