I really enjoy custom projects like this--to build a bag specifically around the needs of the user. This one is huge. It measures 12" deep, yet is narrow enough that you can still see over your shoulder when riding in traffic. There are side compression straps to cinch it down when your cargo is smaller, and a velcro roll top closure to keep your stuff dry--yet easily accessible. Deep tripod pockets on both sides, and front laptop compartment make it perfect for hauling photo gear, and keeping it easily accessible.
Its made with a durable Ballistic Nylon bottom, 1000 Denier Cordura body, Vinyl interior liner, and 1.5 Webbing and buckles. Padded back and shoulder straps are comfortable and highly adjustable.