
We used them with our 3 kids for two years. The idea is fantastic, but the plastic used in the earbuds breaks after about 3-4 months from repeated heating/cooling. We have 6 stainless steel cases and lids and have tried over a dozen inserts. They always break after 3-4 months, and you have to order from the manufacturer for another $5 each (and you have to call them, otherwise you can't buy inserts). After two years we just gave up and bought one-piece stainless steel food bottles instead.

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