Here's some info to file away for a future trivia night - wine bottle sizes. These sizes are for still wines. Sparkling and Champagne sizes are a little different.
187.5 ml - Piccolo or Split - Typically used for single servings of Champagne.
375 ml - Demi or Half - Holds one half of the standard 750 ml size.
750 ml - Standard - Most common wine bottle size.
1.5 L - Magnum - Equivalent to 2 standard 750 ml bottles.
3.0 L - Double Magnum - Equivalent to 2 Magnums or 4 standard bottles
4.5 L - Jeroboam - Equivalent to 6 standard bottles
6.0 L - Imperial - Equivalent to 8 standard bottles or 2 Double Magnums
9.0 L - Salmanazar - Equivalent to 12 standard bottles - a full case of wine!
12.0 L - Balthazar - Equivalent to 16 standard bottles.
15.0 L - Nebuchadnezzar - Equivalent to 20 standard bottles.
18.0 L - Melchior (not pictured) - Equivalent to 24 standard bottles - 2 cases of wine!