This Blackcaps NZ Cricket Backpack is an excellent backpack, both in size and features. 

The Black Caps backpack measures approximately 47cm (18 1/2") x 52cm (20 1/2") x 9cm (3 1/2").  It features:

• Official Blackcaps logo on front
• Adjustable pull cord on front to increase or decrease bag capacity
• Double zipper plus Blackcaps pull tabs
• Adjustable shoulder straps
• Large hook strap for carrying or hanging bag
• Name/address label pocket on back of bag
• Blackcaps logo air vent
• Inner padded velcro'd pocket

This backpack would be great for both adults and children.  Stylish but practical as well.