As a quick easy-access sling bag, the classic messenger is excellent. But it wasn't perfect. That's where Peak Design comes in - they took the old standard and improved upon it tenfold. Their version, which was designed in a partnership with renowned adventure photographer Trey Ratcliff, has the added benefit of their FlexFold reconfigurable internal divider system, a MagLatch secure flap closure, and a system of Dedicated Capture clip attachment points to secure all of your precious gear. And everything that fits in the surprisingly roomy 15" pouch will stay protected by a 400D weatherproof nylon canvas shell.