Whatever is on sale.
I have a mix of jugs (4 and 5 qt) and qt bottles.
I also have a 6 gallon bag of oil.
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1994 Honda VT1100C: 8,000 miles, Peak 15w-40, Fram Tough Guard filter, 3k OCI
2002 Ford F150: 192,000 miles, Havoline High Mileage 5w-20, Ecogard filter, 5k OCI
2012 Scion xB: 41,000 miles, QSUD 0w-20, Car Quest Blue (Wix made) filter, 5k OCI