I use this several times a week, often multiple times in a night. It holds six bottles on the bottom. I use Comotomo-- which are very wide and hard to place in lots of cleaners/warmers, but it fits here with no trouble. The top has a perforated tray that will hold quite a bit in the way of nipples, baby spoons, bottle caps. Bottle-wise, I'm able to get about four of the 5oz Medela bottles to fit (standing up). The downsides are that the machine is silent-- so you need to physically look at it in order to see if it is done; and that the bottles do not dry when you remove them from the steamer-- despite the heat. They keep droplets on them as they cool. This, however, might just be a steam cleaner thing.