This bag is made of 30 ounce canvas (2/0 duck) and the corners are reinforced with truck tarp material. Metal dowels hold the load and keep the bag straight. The flaps extent five inches down the bag on all three sides. The O ring allows you to run a strap under the belly and the extra buckles will accomodate our top packs.26w x 20h x10d.(click to enlarge photo). Made by Buckstitch Canvas.