They are not securely attached to the advent bottles. If I flip the bottle over the top will fall off. I have not sanitized them (boiled for 5mins) so I don't know if they will shrink to fit to size. All it's doing is covering bottle nipple to stay clean and why I am giving it a 3 star as it's only doing half the job it's suppose to be doing. It can not be used for on the go as it will eventually leak.
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