Patagonia Chacabuco 32L Backpack Drifter Grey Equipped with a tube port, the sleeve also accepts a hydration reservoir when you leave your laptop at home A secondary compartment stores everyday necessities like keys, pens and a phone A zippered outside pocket holds energy bars or small essentials, and a brushed tricot-lined top pocket protects sunglasses or an audio device Two stretch pockets keep water bottles within reach The Chacabuco's suspension system uses heat-venting airflow mesh on the back panel and shoulder straps