we use Playtex vent-air and Avent bottle . though the avent 8oz bottle fit perfectly all the way around the bottom , and on the top we put the 4 oz bottle for little random feeding when I know he not go to eat more than 4 oz . then we use one of the peg on top for the inner piece . now when you store that many bottle one of the larger peg on the bottom or in we case two be dedicated only to the nipple , which we have to stack several on top of each other . my only issue with this bottle rack be that I wish it be larger . and not round , the cap we end up put they on the bottom towards the center which make they not sturdy and they end up fall out or be extremely hard to reach when you need they . you need to take off some bottle and they reach in . I would like it alot better if it be rectangular instead . the spin would not be necessary then .