The Yerba Pack from Patagonia is a single compartment daypack with self-fabric back panel, airflow mesh shoulders straps, and an exterior stuff pocket. The single compartment accommodates books, binders, lunch, an extra layer, and its padded sleeve is raised to help protect up to a 17-inch laptop. A zippered microfleece-lined top pocket holds audio devices or sunglasses, a stash sleeve stuffs a shell, and dual stretch-woven pockets carry water bottles. Shoulder straps are made with airflow mesh to keep you cooler in the heat. For day hikes, leave the laptop at home and slip a hydration reservoir in the computer sleeve, which comes with a tube port. A lanyard secures your keys and an internal organizer holds pens and other small items. Made from tough but supple 420-denier 100% nylon oxford plain weave with 840-denier 100% ballistics nylon reinforcements this pack will withstand heavy use. The lining is 200-denier 100% polyester.