Lightweight, durable nylon construction. A lot of storage in a limited space. 19-1/2" x 9-1/2" open, 7-1/2" closed. Aluminum clipboard 5-3/4" x 9" with Velcro fasteners. Kneeboard attaches to leg with Velcro and elastic strap. Two clear vinyl pockets: one for the aluminum clipboard - the other for charts, checklists, etc. Two nylon pockets for additional storage. Elastic straps hold larger items in place. Two pencil holders included.