Sippy cup manufacturers need to come to an international agreement in regards to the way they manufacture their goods. Not necessarily the sippy cups them selves, because I like all the different shapes and size and colors and handles options, but more so in the way they make the little-rubber-stopper-sucky-prevent-leakage thing that fits into the lids of the sippy cups.
We have multiple cups in our house. There is one for milk, one for juice, one or two for water, and of course some back up cups. These little rubber pieces need to get washed everyday otherwise mold will grow in them. The problem with the rubber-stopper-sucky thing is, is that I have to figure out which cup gets which rubber-stopper-sucky thing. Not one brand of sippy cup is compatible with another brand. If I put the wrong one in the wrong cup there is potential for spillage. Or maybe the suckage/flow factor does not work for a specific cup and Max gets frustrated and ends up throwing the thing across the room.
I have another issue with the way these plunger devices are made. These rubber plunger type things are usually two sided with one side that fits into the mouthpiece of the cup and the other side that fits into the airflow hole on the under side of the lid. Most of them are made out of a clear rubber with a clear arrow printed on them to indicate which side goes into the mouthpiece and which is for airflow. These things are small and they are already clear. How am I supposed to see a tiny clear arrow on a tiny clear piece of rubber at 5 in the morning? Bad design I tell you.
So I propose a universal rubber-stopper-sucky thing for all sippy cups. Gerber, Playtex, Avent and what ever other company listen up. It would make my life easier.
Google search is going to have a field day with these keywords.