Seat Bag, Expansion Space Perfect addition to your bike to hold extra tools or even snacks for the trail Tailight mounting spot 4.2 oz., 7" X 4" X 3", 0.75 L capacity The MSR Seat Bag is the perfect addition to your bike to hold extra tools or even snacks for the trail featuring expansion space to the saddle bag by simply using a zipper and a mounting spot for a taillight. *Does not include tools. 4.2 oz. 7" X 4" X 3" 0.75 L capacity