Marmot’s Air Flow Series features a frame system consisting of a durable, high vent fabric mesh tensioned as a trampoline on a lightweight, flexible, hub-based, hollow pole frame. This offers a lightweight, high ventilation and durable frame for done-in-a-day sized backcountry packs. Patent-pending Split Wrap waist belt. Front pockets. Hydration pocket and port. Waist belt pockets. Day-sized packs in the series are the Pampero and Zephyr.