The Moby 5 is a Large Roller Backpack that is made from 300/400-Denier Nylon. The Grades of Denier were chosen to keep Weight-Down, but keep Durability-Up. The Large Main Compartment has a Dual Zipper Slider U-Shaped Opening which allowing Easy Access to all the Large Gear and Accessories-Stored-Inside. On the Outside of the Bag there are two Large Bellows Pockets with Dual Slider Zipper Closures, the Upper for Small Items and the Lower for a Regulator Bag. Two Side Pockets for Fins and a Small Luggage Tag Window for Travel complete the Storage Area of this Great Bag. All Zippers are Strong and Durable YKK-Design. When you Travel, Bag allows you to Maneuver through Busy Airport, Train or Bus Terminals with its Reinforced Telescopic Handle and Wheels. One of the problems with Wheeled-Bags is once a Wheel Breaks, the Bag becomes Useless. Not with the Moby 5, Wheels are Removable, so they can be Replaced-if-Damaged. Once you have arrived at your Dive Destination and Rolling the Bag on the Beach or Tight Dock Space is not an Option you can open the Hide-Away Shoulder Strap Pocket and your Bag can now be Carried-on-your-Back. Adjustable Shoulder Straps are Padded and for Added-Comfort. There are two Carrying Handles: a Reinforced Rubber Gripped Top and Ridged Bottom. The Back of the Bag houses Supporting-Rods to keep the Moby 5 in a Vertical Position. The Bag has a total volume of 7,018 cubic inches (115 liters) with the Main Compartment measuring 30" x