Totally re-designed in 2006. Made of the same tough construction as our OFA bag, the BrainBox is constructed with a "hood up" design, allowing you easy access to all of your gear. Features a reflective strip for visibility. There's also added an insulated bladder sleeve that can accommodate a 30-50 oz. bladder. Fits the EuroMesh and Carbon Hard Shell seats. Size: 600 cubic inches.