Roll-up construction with elastic and hook fastening. The built-in laptop sleeve can hold up to a 13" MacBook Pro or a similarly sized laptop. Front zippered pocket for valuables and 2 side pockets for a water bottle. Adjustable front strap for easy storage of jacket, shoes or ball. The main fabric contains at least 90% recycled polyester, excluding hems and details. Top handle and chest clip for a more secure fit. Dimensions in full condition: 12.5cm W x 43cm H x 27cm L (folded and secured with a strap). Volume: 18L (folded and with secured strap).