Check the listing for details. Lightweight Ventilation Backpack Spacer for Hiking, Commuting, and Biking. Color: Lightweight Ventilation Backpacking Packs Is Black, Condition: New with tags. Listed at 35.52 USD. Lightweight Ventilation Backpack Spacer, Backpack Spacer, Hiking Backpacks Spacers, Commuting or Biking Backpacks Ventilation Frame, Reduce The Weight of The Improve Airflow and Decrease Sweat 6.93 in*12 in This size is suitable for users with a torso of 5 feet 3 inches or more and can cover the back length of most adults (from the shoulders to the waist) Backpack Spacer Lightweight Ventilation Backpack Spacer Backpack Ventilation Frame backpack spacer ventilation backpack back spacer backpack frame backpack frame only backpack frame insert backpack sweat spacer backpack spacer back Rucksack Frames outdoorsman backpack ventilation spacer external backpack frame lightweight breathable mesh backpack frame