The FastBack Tool Pouch is for those couple of tubes, tire tools and cell phone that you never quite have a place to put. Fits nicely onto a FastBack 4.0 or M70 Hydration Pack, it can also be mounted directly onto some recumbent bikes, trikes and racks. The Tool Pouch is essentially a rectangle, with the top and bottom lengths at 102mm (4"), the sides at 216mm (8.5"), and a 51mm (2") depth. The clip-on strap is 178mm (7") long (51mm (2") of which is the clip). The Velcro straps reaching from the top are 114mm (4.5") and the ones from the bottom are 95mm (3.75"). Toss that camera in there and take a picture of yourself at the top of the mountain, riding farther, having more fun on your bike.