While I'm on the topic of shampoo, I'd like to mention something that I thought everyone knew but I guess not... if you're flying and you have bottles with liquid in them, keep them from exploding by squeezing some of the air out of them before closing (so they're a little crushed). That way, when the pressure drops, the air inside will expand... if you don't squeeze out air and the air expands, it will force the cap to pop open or the bottle to explode... and you end up with shampoo everywhere. And don't keep pens in your checked luggage!!!!!!!!!!!!