Another small, unknown product I saw that I thought was pretty cool was the Sippy Express. It's a bottle topper that turns almost any water bottle or juice bottle (even the wide mouth bottles) into a sippy cup.
The Sippy Express goes on over the top of an open bottle with a twist, and even though it doesn't use the threads of the bottle top itself, it still would be hard for a child to remove. The representative demoing it for me turned the bottle upside down, and while a couple drips fell from the bottle, it held the liquid in really well. There also isn't any valve that removes (like all my sippy cups). It's BpA free and dishwasher safe and fits 99% of all widely available water bottles and juice bottles.
It's a brand new product, but should retail for around $2.99. Check it out at SippyExpress.com.
