If your office on any given day moves from the coffee shop to the park and then to the pub, throw your 13 inch laptop in the Patagonia Mass Sling and pedal to the cafe in the morning. The Mass Sling positions the load behind the shoulders, and the single strap design makes getting to your stuff simple just spin it around. When you get to the park, your essentials are still organized in this sling's ample pockets there's even a bike pump pocket so you can air up before hitting the pub. If you are commuting in hot weather, the breathable, moisture moving 3 D spacer mesh pads on the shoulder strap and molded back panel keep you cool. If your work or last pint for the day stretches into darkness, at least you'll stay seen with the reflective panel on the front and the bike light not included attached to the designated lash point.