WHY YOU'LL LOVE IT VaporAiress is a pack that is as versatile as you are. Body-mapped and designed specifically for the female form, it’s our first race vest to feature the innovative Adaptive-Fit ™ Adjustable Sizing System, resulting in a fit and feel so personalized, you’ll think we tailored it just for you. Store everything you need for a full day with the large main back storage compartment and back kangaroo pocket, sized for a light jacket, nutrition, and even more hydration than your 2L bladder can carry. Lace your shoes, stretch your legs and get ready for your best day out on the trail or road.