Generously sized Wheelchair Carry-All Backpack is great for books, groceries and other heavy items. Full-width backpack pocket inside helps keep things in order. The top flap has a Velcro closure. The Wheelchair Carry-All Backpack is made of waterproof nylon with a rigid bottom liner. Attaches to the wheelchair?s handgrips by strong nylon straps. Wheelchair Carry-All Backpack Features: Great for books, groceries and other heavy items. Top flap has a Velcro closure. Wheelchair Carry-All Backpack Specifications: Measures 14 x 14 x 4 inches.