973G: 1 gallon bottles (4/case), sold by the gallon; 973-5: 5 gallon pails, sold by the pail; 973-15: 15 gallon drums, sold by the drum; 973-30: 30 gallon drums, sold by the drum; 973-55: 55 gallon drums, sold by the drum; 973-270: 270 gallon totes, sold by the tote.