Nathan Vapor Airess 2 Lite 4LWHY YOU'LL LOVE IT: The VaporAiress Lite takes our Adaptive Fit feature to the next level with a new "set it and perfect it" hook loop design. Made of lightweight and breathable mesh stretch woven materials for maximum comfort. Equipped with a 2L bladder with a quick release valve and 7 pockets, including multiple back pockets for additional items, plus bottle pockets in the front to fit up to 22oz flasks.