Abstract: A multilayer, free-standing stack of bales is built from the bottom up in a machine that forms each successive layer and then raises the layer directly overhead to retaining structure that supports the layer, as well as any others above it, at a high enough elevation to avoid interference with the formation of the next layer therebelow. After the stack has been completely built by raising successive layers up to the retaining structure, the stack may be discharged out of the machine while still in an upright condition and at any selected one of a number of vertical positions, e.g., onto the ground or onto the bed of an awaiting tractor-trailer.