[mommy3]

We use Gerber ones -- you can buy extra tops and valves, plus they are simply built. You can throw them across the room (ahem. . . it does happen, ha) or leave them on the furniture--and they don't leak. If one hides under the seat in the car for several days and makes yogurt (hmmmm), you can soak the valve in bleach and it's all fine again. They are indescructable, almost. We have a few that were my ds' as a toddler, pretty amazing. You can buy the parts in a grocery store in our small town, also amazing. They aren't trendy and don't have a fancy name but they do change colors when a cold liquid is poured in them (which no one cares about in our family, we learned). susan