This bag is for the back of a manual wheelchair. It hangs from the handles and is big enough to hold papers, supplies, and many other items the patient or caregiver may need. It measures 17" wide X 12" tall X 2" deep. There are 3 open pockets on one side and one large open pocket on the other. Inside the zippered pocket is a large open area and 4 smaller open pockets. The straps are made from 1" webbing and are adjustable to fit wheelchairs from 18" to 24" wide. This bag is made from sturdy Sunbrella acrylic canvas in black. Sunbrella is water and UV resistant.