Sprint and Olympic distances on a P3.
Do you put the waterbottle on your Xlab Saddlewing, or forget the behind-the-seat setup and put it in a cage on your downtube?
Forget the rear cage for the shorter stuff. Use the downtube or a front aerobottle. I personally use a front aero bottle at almost all of my races as I hate to get out of aero to drink, especially in the shorter races. I love the convenience that little straw offers.
I use an Xlab Flatwing for all distances on my P3- mostly because I’m too lazy to put it on and take it off all the time for different distances. Plus I can store all my gear on it without a saddle bag.