Now this backpack is truly cool". Super-Light and Very-Roomy, the Folding System is its Key Feature. It takes less than a minute to Easily Fold it, turning it into a Small-Size Carrying Case. It has two Integrated Side Pockets for Storing your Fins and Adjustable Compression Straps on the Outside. Front Pockets and Handles for Transport. Easy Foldable Backpack with Wheels. In less than a minute the 4.52 cu ft (128 liter) Capacity Bag can be Folded and Transformed into a little Business Bag with an Upper Front Pocket that is Completely Removable. All Mares Bags include Rugged and Durable constructed Wheels. With a diameter of 3.5" (9 cm) and a with a tire tread 1.2" (3 cm) wide, they can Maneuver over Streets, through Airports and to your Dive with no problem. All Mares Bag Wheels are attached with Corrosion Resistant Stainless Steel Screws. This System makes the Wheels much more Durable than Bags using Rivets.When the terrain gets a bit rough, with little effort this large piece of luggage can be transformed into a Comfortable Backpack. A Big Pocket positioned under the Bag"s Case contains two Big-and-Soft Shoulder Straps. In a minute your Wheeled Bag becomes a Backpack. Additionally, the innovative Mares X-Strap System converts the Traditional Handles, by attaching to a Metal Snap Hook, into the Shoulder Straps of the Bag. Just put the Padded Shoulder Straps Over-your-Shoulders and you can maneuver through the Busiest Airport Terminals, Sandy Beaches, Up-or