The Blackburn Local Trunk Rack Top Bag is pretty genius. Sure, it's made of tough, water resistant 210D ripstop polyester, has a removable shoulder strap, and is compatible with Blackburn's theft deterring Interlock racks, but the smart part is how it carries such a huge amount of gear. The zip open lid is a pocket itself, and a big one, that reveals a large main chamber beneath. The party trick, however, is that the outboard pockets unzip and unfold to essentially double their apparent volume into a wide pair of vertical chambers. Yes, that means this innocent looking trunk bag whips out the devilish deception of being able to carry big books, a laptop, picture frames, and all other sorts of long, flat, rectangular stuff you always manage to find but can't haul home. Well, no more. Built to last, this is the last rack bag you may ever need.