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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.
Weight depends on the type of hay and settings of the baling equipment. Round bales also vary in sizes, the smallest of which is around 4' tall. Edit2: Manufacturers use the term Square bales to differentiate between those and round bales, even though the bales are rectangular.