K.S.
I have a friend in Grapevine who sells Tupperware and I just bought a set of cups that have lids with a drip proof seal for a straw. They are terrific for my accident prone almost 5 year old granddaughter. I cant tell you how many times she's accidentally knocked her or someone else's drink on to the floor.
The little juice boxes and CapriSun's are handy. I don't have problems so much with the liquid bubbling up the straw as I do with the kids squeezing them and spraying juice all over the place intentionally or unintentionally.