The Rear GO Bag fits perfectly in the frame of the ElliptiGO between the tracks directly under the rider. The bag fits into position between the tracks, and on top of the plastic mudguard. A velcro straps secures the bag around the arching cross bar. The bags dual zipper allows access to the inside of the bag while secured to the frame. Inside pockets and the bag itself provides room for food, tools, supplemental water, light clothing, or other items that may be needed while riding. This is a great to carry things that you might just need on that next ride.