I hesitated to buy after this kind of bottles had so many mold problems, but the cap design on this bottle is different and we haven't had any problems yet. Unlike other bottles we've bought under the Contigo brand, the top of the cap is transparent so you can see if there's mold. There is no hidden compartment that needs to be disassembled to get to it - I disassembled and checked. The new straw design is great - we no longer have problems with straws constantly falling out. However, after 5 months we noticed that it started leaking from the top. I'm not sure if it fell or what happened but we need to take a close look to see if we can figure it out. I highly recommend getting the following to help with the cleanup: OXO Tot Straw and Sippy Cup Top Cleaning Set.
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