I am not sure if you are crafty but here is a link to a pretty easy way to make a mason jar into a spill proof cup. Well as spill proof as you can get with a straw. Hope this helps some, I may try it myself down the road.
and it is amazing! I'm using it for baby food, I can make it fresh in a couple minutes right before feeding, but when she's bigger i'll absolutely use it for smoothies, or for me in a coulple weeks when it starts getting hot.
Plus, there's another eco friendly aspect- less parts used, less water for clean up!
Re: **Rochell** And anyone else looking for glass sippy cup!
Also, I recently found this blender that attaches right to the mason jar
https://www.amazon.com/Tribest-PB-350-Mason-Personal-Blender/dp/B0034JQSP0/ref=sr_1_3?ie=UTF8&qid=1338425093&sr=8-3
and it is amazing! I'm using it for baby food, I can make it fresh in a couple minutes right before feeding, but when she's bigger i'll absolutely use it for smoothies, or for me in a coulple weeks when it starts getting hot.
Plus, there's another eco friendly aspect- less parts used, less water for clean up!