I <3 my Camelbak
Originally I bought a Nalgene OTG bottle, without doing any research. When I got home, I read this on their site:
"So, what we're saying is enjoy the indestructible quality of the bottle, enjoy your liquids without the "dreaded" plastic taste & smell, enjoy the fact that this quality bottle was manufactured in the USA, but don't put it upside down in your backpack."
Uhhh, if I designed a water bottle and it LEAKED, it should be straight back to the drawing board. A slight design flaw, don't you think?
I took it straight back to the store and exchanged for a Camelbak. You don't even need to tilt it to drink, eliminating spinning class showers...and it looks not much bigger than my old 500mL bottle but actually holds more than 750mL, so I get an extra 2 cups of water a day without realizing it.