Columbia Xtender Backpack The Columbia Xtender Backpack is beautifully streamlined, yet highly functional; combining a clean exterior with a padded 17 laptop sleeve and a stash pocket with access at the bottom for any cargo you want to keep separate. It features the amazing Omni-Shield advanced repellency which helps protect the contents from snow and rain, while the backdraft ventilated of the back panel utilizes the directional foam conduits, allowing the hot air to rise and replacing it by cooler air to keep your back really comfortable and dry. The straps of the backpack are made are ultra-lightweight with Techlite for a much comfortable feeling. Plus, the back is complete foam padded. The Columbia Xtender Backpackhas a sternum strap and an intuitive suite of pockets and organization to keep everything in its place. This backpack is a well-rounded for all of those adventures. So go ahead, go out there and explore.