Heavy duty and fully functional backpack from Billabong - the Samourai includes a wet-bag inside which can be removed - allows you to store wet gear (towell/wetsuit/trunks etc) without getting any of your other gear wet.
This is a good sized bag with a very well padded back (4 section mesh padding to help it breath) and quite technical back straps - including an across-the-chest strap to help support all that weight you might start carrying around..

A good looking design print on the front in black and red with Billabong embroidered writing logo in white. The back has a couple of print designs  on it too.

features:

• made from tough polyester
• velcro close wet bag inside with attachments
• fully adjustable back straps
• breathable back padding
• multi-pocket design:
• large front zip section includes 2 x velcro pockets inside. lined in black
• another large zip section behind lined in black
• large main compartment lined in black includes gathered pouch suitable for ipod etc
• headphone exit section at top of bag
• top carry handle
• internal wet bag 46cm high x 36cm wide when flat
• main bag size is 48cm x 18cm x 33cm wide
• big enough for A4 folders and much more