The largest pack in Marmot's Tool Box series, the Tool Box 30L Backpack performs the perfect double duty for both your commuting and trail life. The main compartment contains a padded laptop sleeve that can hold most 15-inch laptops, but also offers the perfect spot for your hydration bladder when headed for a hike instead of class. Padded shoulder strap and a ventilated back panel keep every trip comfortable, and the 30L features an adjustable waist belt for extra support. Two side pockets are the perfect place to stash water bottles, a fleece-lined pocket at the top gives you quick access to sunglasses or smart phone, and a front zippered stash helps you organize small essentials.