While designed to perfectly fit the Thule Tour Rack, the Pack 'n Pedal Commuter Pannier will still install on either side of virtually any conventional rear rack. It's also waterproof, so its roll-top opening is the only possible point of aquatic ingress. In addition to a small storage pocket, the interior features a secure annex for laptops up to 15in, and a host of straps keep the cargo secure and tidy. When not in use, the mounting hardware is hidden by a magnetic flap. As a result, it won't snag anything while you're toting the bag with the hand loop or detachable, cross-shoulder messenger strap. The Pack 'n Pedal Commuter Pannier is constructed from a durable, abrasion-resistant fabric that resists weather and tarmac alike, so on those unfortunate days when rain slicked asphalt threatens wash outs while cornering, at least your laptop will be safe. The pannier is finished with reflective detailing, which will come in handy by helping to keep you visible to other road users on those overcast days.