The REESE® Olympia hitch mounted cargo carrier bag gives you the extra storage space you need outside your vehicle. It’s made from black water-resistant PVC tarpaulin with sonically welded construction and is expandable, providing up to 11 and a half cubic feet of capacity. The Olympia hitch cargo carrier bag fits into and attaches to any hitch-mounted cargo carrier. (which can be installed on the front or back of a vehicle, depending on your needs) with a half dozen straps to keep it securely attached. To use the canvas bag, simply set it in the hitch cargo carrier you plan to use, unzip and pull the flap down, then load it up with the heaviest items first. Once you’re done and the cargo carrier bag is full, zip it closed, making sure the flap is pulled down so it covers the zipper and is sealed by the hook and loop closures. The Olympia hitch cargo bag also features a secondary zipper for those times when you need a little extra room