This is a very large aftermarket cargo bag made in Colorado by Defiant Pack. It has almost twice the capacity of a standard Xtracycle X2 Bag and comes in a variety of color choices. NOTE: These are sold as individual bags. If you are ordering a pair it is possible to mix & match colors.
These bags are specifically designed to mount to Xtracycle(tm) bikes and long tail extension kits with double railed Heavy Duty V-Racks (also known as Pannier Racks). They are also compatible with the standard V-Racks and Surly Big Dummy.