I may have mentioned in this thread that I have 200 different (mostly) empty water bottles in my office. My personal award for clever packaging goes to Park City (UT) Icewater - it is a collapsable bottle that is completely flat by the time you have drunk it dry. That way, you're more likely to stash it in a pocket and dispose of it properly at the lodge than to toss it to the side of the slope as you ski down.