The long-awaited sequels to the VaporAiress & VaporAir push the boundaries of fit and comfort, thanks to the body-hugging Adaptive-Fit adjustable sizing system. Offering an inclusive pack fit for runners of all body types, it provides comfort over the long-haul, regardless of pace, distance, terrain… or how much you sweat. Unzip the two front inside pockets to reveal hidden adjustment straps that cinch the side panels tight, for a snug, close fit that stays secure mile after mile. It’s the first-ever pack that hugs you back.