The Batman Sublimated Backpack is kind of like Batman's utility belt. It has a pocket on the front, a media pocket on the top, secret pockets on the back, say what?! Not to mention the inside has yet another pocket and an 11.5" X 12" laptop compartment and separate 11.5" X 10" tablet slot. Measuring 18" long X 12" wide X 4" deep, this canvas style Batman Sublimated Backpack can hold a whole lot of stuff. I think you'll definitely have space for your grappling hook and Batarang.