This bra can be customized in a million different ways. I am a heavy chested woman and did not expect this would work for me at all. Not only does it fit, but it's comfortable and a pretty pink color. Most importantly, it is completely secure. Now I just need a portable pump and I can walk around the house while pumping. There is no way the bottles can move. They stay put. The most I've had on either side would be 4 ounces but I have no doubts that they would hold more.