Dimensions:

Rolled height: 16 inches (40cm)
Total height: 25 inches (63 cm)
Width: 16 inches (40 cm)
Depth: 7 inches (17 cm)

Also, the backpack has two outside pockets and one inside pocket.

Inside pocket:
Height: 8 inches (20.5 cm)
Width: 8 inches (20.5 cm)