Never used Marmot Toolbox 20L backpack. My son ripped the tags off of it but never used it. Padded laptop sleeve within main compartment and it doubles as a hydration sleeve if you decide to hit the trail instead of class. Padded shoulder straps, sternum and waist straps for added support. Mesh padding along the back for ventilation in warm weather. 2 side pockets, a fleece-lined pocket at the top for quick access to sunglasses or phone and a front zippered stash for small essentials. Internal key clip keeps your keys easy to reach. Perfect size backpack to carry everything you need and not weigh you down!