Wow! I love these mugs! They are indeed sealed! You didn't spill a drop! I've only had them for a short time and will update my review if/if they start leaking but whilst they are amazing I have a 19 month old who loves to hide cups and an autistic 3 year old who who loves tossing his cup around. , tap it and chew on the nipples (as if the nipples are partially missing/missing!) This will cause the cup to leak. And I've searched hundreds of sippy cups/training mugs on Amazon and found them, and trust me when I say these mugs have solved all my problems! They are sealed around the lid and nipple, they come in two packs for my two girls and different colors as my autistic daughter gets medication in her cup at night so it's very important that we don't mix up her cups, and they are very good strong! The only problem I have is that the silicone part inside the valve is difficult to clean completely. I mean I wash it but it's hard to hand wash it. Haven't tried the dishwasher yet. But most of all I love these mugs! UPDATE: I bought two sets of these mugs and a blue one in each set. not exactly fluent, but when you unscrew the cap, if you tighten it a little, the liquid pours out. Spout (rather high) casts decently and quickly. But after that, you can shake it up and the remnants of what's in the sink will "run out", but after that nothing will flow out anywhere. I don't know why and it's only blue cups. I changed the valves from blue to red so that's not the case. I didn't change the caps, maybe it's the caps? Overall I still really like that they don't leak during use and are good cups. Fairly drop/throw proof.
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