Maybe the courses I run are just bumpy, but anyone else running a profile aerodrink have the same problem here? Every race I have to keep pushing the yellow koozie back in, and I've also dumped it twice in 2 different races (one I was able to retrieve it afterwards, another it was long gone). Any tips to keeping it from taking off? I noticed others losing theirs as well....

Mine has a lid that fits over the top. It's a black plastic cap that has slits cut into it so it can be filled on the fly. It appears to be what they show on their split drink bottle;
https://www.profile-design.com/produc...tion/aquacell/

I was in a bike shop yesterday and noticed that they were selling the one without the lid.

Loss of the yellow sponge was/is a common problem. The newer models have the lid.

Put a peice of plasitc wrap (held in plce w/ a rubber band) over the opening.

The secret to the yellow thing is that you need to "mold" it into an irregular shape. It takes a few minutes to get it right. That said, I bought a new bottle this season...the one with the lid. I raced with it yesterday and it is MUCH better.