Instruct: Classify Amazon reviews into positive or negative sentiment
Query: They leak - not using Evenflo bottles

We used lvl 1 nipples on our evenflo, avent, and Medela bottles with no problems. These level 2s leaked in all of our bottles. We aren't using the evenflo bottles anymore since she drinks more than 4oz at a time now. At any rate, they're leaking and I've thrown them out. :o(