Seat Sack Elastic Back chair pocket in black expands to fit chairs 12-17" wide. This seat pocket features a durable laminated fabric that is certified flame-resistant and machine washable. The Seat Sack student organizer has a 10-inch-deep pocket and a 2-inch gusset that offers ample storage space to accommodate tech devices, books, papers, school supplies and more. Fits chairs that measure 10 inches or less along the very top and widen to 17" at the pocket. Perfect for classroom storage, teaching vital organization skills and keeping classroom materials managed.