A new and innovative idea for biking water bottles. Water bottles tend to get "gunkee" on the inside bottom making it very difficult to clean really well. Now a new water bottle is on the market that has a normal screw on top AND a screw on bottom. The "screw off" bottom makes is it so easy to clean the bottle. The bottles are a little pricey at $10, but may last longer because if can be cleaned more thoroughly. YES, I got my "Clean Bottle" in the mail today and it is FANTASTIC! What a great idea. Check out their webpage at: http://www.cleanbottle.com/ by clicking on the "Clean Bottle Toy" above.