The JacksonPac is the original VestPac. Born out of necessity on the ski slopes of Jackson Hole, Wyoming; the JacksonPac has become the quintessential minimalist hydration pack for the outdoor sports enthusiast. Dual chest pockets with security flaps keep your phone, gps, keys, or snacks within easy reach. Both front and back are constructed of our revolutionary 3D Airmesh for sweat-eliminating climate control. Rugged elastic straps provide a secure fit for all sizes, ensuring the JacksonPac never bounces or rubs.