The Patagonia Men's Refugio Pack 28L has three main pockets, to keep you organized without feeling fussy. The main compartment holds much of the load and comes with a dedicated computer sleeve that accommodates most 15" laptops (the same sleeve also accepts a hydration reservoir when your feet leave the cement). The second, zippered pocket holds smaller items like a paperback or tablet, pens, business cards or keys. A pocket on top of the pack protects sunglasses or an audio device. Stretch-woven side pockets accommodate a full range of water bottle shapes and sizes. Air Flow mesh on the shoulder straps and back panel prevents overheating while compression straps stabilize contents. Made from 450-denier 100% recycled polyester, with a 450-denier 100% recycled polyester base. The lining is200-denier 100% polyester. All fabrics have a DWR (durable water repellent) finish.