Zappos.com is proud to offer the Patagonia - Critical Mass (Mango) - Bags and Luggage: Commute on your bike with the handy and versatile Critical Mass by Patagonia. It will fit all your essentials safe and secure. ; Main compartment has removable/modular padded computer sleeve that attaches to the removable waistbelt to create an on-the-go computer sling and free up valuable space; sleeve holds 15- 17 laptop safely above ground; internal zippered security pocket and organization for pens: light-colored lining makes contents easy to find. ; Large elastic stuff pocket holds jacket or sweater. ; Outside pocket on cover flap has water-resistant zipper; external side pocket for easy-access to water bottle, cell phone, keys or power brick. ; Topside carrying handle. ; Adjustable padded shoulder strap has detachable, fleece-lined electronics pocket. ; Waistbelt secures bag, detaches and stows when not needed. ; Flap overlaps sides to keep out rain; reflective strip improves visibility in low light. ; 8.4-oz 600-denier 100% recycled polyester. Lining: 3.3-oz 200-denier polyester. Both with polyurethane coating and a Deluge DWR (durable water repellent) finish. ; 1051 g (2 lbs 5 oz). ; Width: 18 1 2 in ; Depth: 6 1 2 in ; Height: 14 in ; Weight: 2 lbs 6 oz