Go get some of the straw sippy cups. They flip up, so they are a little more grown up without loosing the genius of a spill proof cup. I have purchased reusable water bottles that are also spill proof, so that might work. Or, also in the sippy cup isle is a playtex sipster. It looks like a sippy cup on the bottom, but the lid is different. Looks more like a big kid cup that way. Just a few suggestions. ~A.~
****Ahh, just kidding, it is not a playtex sipster, it is a playtex coolster! They are perfect, just look on the playtex website.