This is basically what I have now. I went from 2 bottles to 1 mainly because I was losing one of my bottles almost every ride. I also used one of the two holders for a spare kit and it actually weighted a bit more than I thought.
Since I moved to one, I havent lost anything (might have been how i set up the back) but I also realized that I dont need to be carrying on the weight of another bottle if I can avoid it. If I am changing out bottles on a race course, why do I need to have 4 bottles? Right now I have two on the inside, one on the back. I rotate between the two on the inside and my aero bottle up front based on what I want for that race. This setup for the back is perfect for me. I only need two or three bottles max on my bike at a time for the races. Training I usually just have 3 (with the rear on always.)
2020 Team Zoot MTN
Since I moved to one, I havent lost anything (might have been how i set up the back) but I also realized that I dont need to be carrying on the weight of another bottle if I can avoid it. If I am changing out bottles on a race course, why do I need to have 4 bottles? Right now I have two on the inside, one on the back. I rotate between the two on the inside and my aero bottle up front based on what I want for that race. This setup for the back is perfect for me. I only need two or three bottles max on my bike at a time for the races. Training I usually just have 3 (with the rear on always.)
2020 Team Zoot MTN