90% of the time, I was very pleased with this product. It kept my daughters milk cold all day long. However, once in a while, if I screwed the lid on a little tight, the rubber stopper would shift ever so slightly and cause a major leak. It happened a few times before I realized what was happening. I became very careful not to over-tighten the lid, but then it leaked because the lid wasn't tight enough. It's tricky to find that perfect tightness and to me, renders it too risky to send my daughter to school with. Her teacher has had to clean up enough milk from her cubby and backpack. I bought 2 of these. In pink and blue. Both have this problem.
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