For a tough as nails board bag, grab yourself an Ocean & Earth Aircon Heavyweight Longboard Bag, which features an additionall 5 mils of waterproofing, making a total of 10MM. 600D polyester, a tail gusset system (so you can keep your fins on), and a protective nose piece make the O & E Aircon Heavyweight LB Bag a beast, and an internal wax/fin bag, removable should straps and storage hooks, and a fin slot makes it a very convenient beast.
