I've about determined there is no such thing!!! Especially amongst the ones with the straws, which are the ones my kids want these days. The Nuby ones, just like their sippie cup counterparts, get the spill-proof part chewed out of the straw the minute I turn my head. The Playtex insulator sport ones, although they are easy for any todller to open and close, aren't spill-proof. The Dora & Diego straw cups by Munchkin seemed to be good at first, but they have started ERUPTING after sitting for a while (I guess as they warm up, they get too much pressure inside...). They also shoot out a bit of their contents every time you flip open the lid. Make that every time *I* flip open the lid, 'cause it's too hard for the kids to open it themselves.
If someone knows of a good spill-proof toddler cup that REALLY IS SPILL PROOF, please let me know.
Or should I just plan to live with eternal chocolate milk spots everywhere we go?
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