To Rebecca's dismay we have recently taken away her sippy cups. Because she wanted me to drink her water out of one, and it tasted like awful plastic. Sorry chicky, that's just gross. And these were supposed to be 'good' plastic. Whatever. They all taste awful, and that just can't be good. Sorry Rebecca, you have a mom with health paranoia issues. Also I hate washing them. I don't know who designed them, but they obviously never had to get the durn things clean. Stupid infinitely deep milk trapping grooves. They were awfully convenient for taking milk and juice around, but now you're just going to have to be content with water in your Sigg, which I also hate washing. I think I need a stainless steel wide mouthed jar with screw top. That wouldn't shatter like my glass jars, but would be just as easy to clean. Hey, I guess those are called thermoses, huh? Huh.