I've been waiting for these bottles to come in since Interbike. FINALLY camelbak has shipped them!
They are AWESOME!!!
You don't need to open and close them- and they don't leak! They have a little dial type switch on the lid that you switch to open. And then you can either suck on them like a normal water bottle, or squeeze them to get them to flow. BUT you can also turn them upside down and they will not leak!
I've been amazing my customers w/ them all weekend.
Another plus is the compound that they used for the bottles won't retain flavors or get that musty smell. It's like nagline, but more pliable.
So no more pulling the valve open w/ your teeth and then slapping it shut on your thigh. Also no more leaking if the bottle falls over.

They come in six colors, and two sizes 21 and 24 oz. I retail them for 7.99 and 8.99 respectively, and that is msrp.
Anyway, just wanted to give them a HUGE thumbs WAY up!!

Check them out here:
http://www.camelbak.com/index.cfm