Aerodrink solutions....anyone?

I'm a plastics guy, so I'll share my thoughts on ways to improve it. I've never tried this, its just what has been bouncing around in my head.

1. Heat up a knife and carve a barb on the rim of the bottle. Do it in a half dozen spots around the mouth of the bottle. Don't make the barbs sharp, because we don't want them to tear the latex/silicone/rubber material that will cover the mouth.

2. Trim a swim cap, glove, something to about 1.5cm larger in radius than the mouth.

3. Cover the mouth of the bottle, stretch a little and catch the top material on the barbs.

4. Hold the material onto the barbs with a rubber band, wire tie, or twist tie, below the barbs.

5. Puncture a hole in the material, large enough to get a bottle top into, for refills, or don't puncture if you don't need refills.

This is just an idea, I've never tried it. Be careful not to cit big chunks out of the rim when making the barbs.

The other option is to try to find a molded plastic top that would fit.  I'm thinking something like a gladware 1/2 cup cover.  You could also try to find a rubber bung plug.  http://www.usplastic.com/catalog/search.asp?search=plug&x=0&... I'm sure you could find something here. 

You could also plastic weld a flip top on.  I'm not sure what material the aerobottles are made of though.  Most likely HDPE or PP.

 ... okay, I have to stop now ...  back to real work .... 

this drives me crazy too.  lately, I've been using a 52mm lens cap that I read about on ST.  This works okay as long as it stays on.  I've had to use a rubber band to make sure it stays on during bumps.  I lost my rubber band for this last ride and it was aggravating.

My buddy uses a thick sponge custom cutout to fit the whole cross section (all the way front to back, side to side) and that seems to work great for him.  I may try that.

http://forum.slowtwitch.com/gforum.cgi?post=1552761;search_string=;#1552761

Recently I purchased the Jetstream Aero Bottle and I have no problem.

I respect everyone's innovation and all that...

...but seriosuly...

...a rounder, thicker shower poofie is all that is required. 

I can pour on the fly and water never spills out.  I hated, HATED this thing after my first ride with the yellow thing.  Put in a shower poofie...it fits tighter...and the whole operation works as advertised.  Done. 

2 suggestions.

When I did have a profile bottle, I put a small hile in the top of the collar, and put a small zip tie thru the hole, in thru part of the yellow thing.  it was easy to move to clean, and it would never come off.

When I got my new bike with only one bottle cage, I figured out that I needed a podium quest bottle to hold 2x the flid on the bars.

Not a solution, but if you want free replacement yellow sproingy things, just go to the bumpy part of a long course triathlon and wait a few minutes and they will come flying off the fancier bikes as they pass by!

If you want to refill during a race without fumbling you can try saran wrap w/a thick rubber band. you can stab a bottle though the plastic to refill.

But, I replaced mine with a shower poofie thingy cut in half and it works fine. A lid kind of defeats the purpose.