Totally re-designed in 2011 with a 2” shorter rear end for a better fit on fully reclined seats. Made with the same tough materials as our other bags, the Brain Box is constructed with a "hood up" design, allowing you easy access to all of your gear and to the insulated bladder sleeve that can accommodate a 30-50 oz. bladder. Also new for 2011 is a double zipper on the hood flap for even easier access to your stuff. The Brain Box also features a reflective strip on the rear for extra visibility and serves as place to hang a flashing light. We even came up with a way to fit this bag on all the Bacchetta seats, Re-curve, Euro-Mesh, and Carbon Hard Shell. Size: 550 cubic inches.