Alright, so here is my review of these stretchy sippy cup things by http://sipsnap.com
DOES IT WORK: These things work very well. I enjoy using the mason jars that come with pasta sauces for water glasses for various reasons. I was skeptical that the sipsnap could fit over the wide mouth and odd shape of the glass, but it worked perfectly, easily holding a full container of water with no leaks. Shaking the glass up and down while inverted did cause a few spits of water to come out, but all sippy cups would have this occur, so no biggie there.
DOES IT WORK WELL?: Aside from holding back water like the hoover damn, I found the flow from the snip snap to be really good. Baby bottles take forever to drink from, and actual sippy cups aren’t that much better in my thoughts. The sipsnap worked really well. The soft sippy spout thing was super easy to latch on to, and it took minimal effort to get a full mouthful of liquid. Even Miss gave it a try, and she thought it was perfect.
WHAT ELSE CAN YOU SAY: Cleaning is pretty easy. I’m not sure if you can stick it in the dishwasher, but a quick rinse in the sink was good enough to be clean for me. The price may be a little high, at 3 sippy caps for 20, but these can be put over anything I found in my cabinet with no worries or stress. The only thing that gave me pause was mugs, but as long as you don’t knock them all over the place you’ll be fine. Every other glass worked pretty well, and kept liquid in through numerous test knock overs
FINAL VERDICT: A+ item for all ageplayers. Definitely worth the buy.