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(Some large round bales can be made a lot lighter and smaller: see the other answers made here.) The large square bales average out at around 1000 to 1200 pounds for straw and I believe around 1400 for hay. Dimensions I've pegged at about 48 tall by 70 long by 48 wide.
Therefore a bale formed on this machine ranges from 52 cubic feet to 99 cubic feet. The maximum size round bale is about 20 times the size of the maximum small square bale, but only 1.5 time the size of the maximum large square bale. A common size for small square bales is 14 x 18 x 36 inches. This is 5 1/4 cubic feet.