The interior dimensions of the chamber are approx. 7.5 inch depth (height), with a 9 inch circumference across.
With the varies shapes and sizes of the bottles that are available on the market, it's hard to determine. In general, it fits about 5-7 wide neck bottles and 8 standard size bottles.
If the accessory basket is removed at the top, this will gives the user an extra 2 inches of space to accommodate taller bottles.