A methuselah is also a really big bottle of wine; six litres to be exact, or about 1.4 US gallons. A methuselah holds eight regular size bottles of wine (750 ml each), or four magnums of wine (1.5 litres each). A methuselah of champagne is a particularly impressive offering at a large party - say, a wedding - but rather too large for run-of-the-mill events. As you can imagine, methuselahs can be rather heavy and hard to pour from.