Austin House Folding Backpack, Blue/Black, One Size Converts to full size backpack Clip attaches to belt loop or purse ring for convenience. Made of mildew resistant 100% polyester. Pouch size: 5.5 inches x 5 inches (13.97 x 12.7 cm) expanded backpack size: 21 inches x 11 inches (53.3 x 27.9 cm)