The justly famous Rabbit Ear Rear Bag can be used with any front bag in this folder. The same size as the No. 1 Standard Rear Bag with the addition of another complete two-compartment bag sewn to its top. This compartment which forms the "ears" is 4 3/8" x 4 3/8" at its base. Each ear is 2 5/8" H and is filled separately. Bag shipped empty- fill with sand or tumbling media. This model features a heavy bottom for increased stability.