DaKine Section 40L
Here's what other sites are saying:
DAKINE's biggest, baddest new surf pack, the Section Wet/Dry Backpack comes fully loaded with a waterproof wetsuit pocket and a built-in insulated cooler compartment. Thanks to 40 liters of storage space and a whole crapload of function-specific pockets, the Section carries everything you'll need for a full day of debauchery on and off the beach.
The Dakine Section Wet/Dry 40 L Backpack has all the features in one! With a waterproof roll top for your wetsuit, a cooler pocket, and a bunch of other organizer pockets.