Most bottles will not fit this, example being Meiomi. The sound quality sounds as good as my little Bose Bluetooth speaker. I will definitely be sizing up in this same style when my son grows out of these! Overall good quality for the price. Great smart features- not too many, and just the right ones. I absolutely loved these fun slippers. Volume was not an issue. Wasted $9 on this one. So all in all I like it for its aesthetic appeal. Me encanto.