Description of Marmot Zephyr Backpack If you are running hood to coast or like to keep day hikes on the light side you need a durable, yet easy going pack. When booking it in lightweight mode is essential, the Zephyr is the daypack you've been searching for. Getting down-right minimal, the Marmot Zephyr Daypack is a no-nonesense ultra-light pack for day-hikes and adventure races, featuring an airflow frame system and a split-wrap waist belt. AirFlow™ packs are constructed with large open side panels that allow air to flow between the user’s back and the frame system, eliminating the dreaded sweaty back. Frame Hub: Technology transfered from Marmot tents to packs. The hub allows the aluminum frame system to flex while maintaining the stiffness needed to create the AirFlow™ channel. Take it light and easy and run with the wind when you pack your gear in the Marmot Zephyr. Features: 2lb 9 ozs / 1.18 kg Shell material: 70d Nylon Twin Taffeta RS 210d Nylon Baby Rip Volume (metric): 26 Airflow Frame System Split-Wrap waist belt Shovit pocket Waist belt pockets for convenient, quick access Hydration pocket and port designed to hold hydration pouch systems AirFlow™ packs are constructed with large open side panels that allow air to flow between the user’s back and the frame system, eliminating the dreaded sweaty back. Frame Hub: Technology transfered from Marmot tents to packs. The hub allows the aluminum frame system to flex while maintaining the stiffness needed to create the AirFlow™ channel.