The Regulator Double/Quad Convertible is the perfectly versatile bag. With a durable 600D polyester shell, thick closed-cell foam padding on top and bottom, and an internal fin organizer, we've crafted it to fully protect your boards and essential itemsâ€”from the roof rack of your buddy's travel van to the cargo hold of an international flight. But the real ingenuity is in its modular design. The Double/Quad is built in two cells, fully connected by molded YKK® #10 heavy duty zippers. Zip it apart and take just one, for a single session or weekend trip where 2 boards will do, or zip it together for longer trips requiring up to 4 boards. This feature also gets you through bag check for the many airlines that strictly limit you to 2 boards per bag. Unzip it, and check 2 bags with 2 boards, then when you pick it up at baggage claim, zip it back together for a singular 4-board-carry bag.