I'm close to adding a BTS dual bottle mount on the road bike to go with the two on the frame. Just tired of putting TWO bottles in my jersey for those 3-4 hour summer rides. I don't feel comfortable stopping somewhere during Covid.
Then I could freeze a pair and put ice in one and be good to go.
I've thought about the backpack but I use my jersey pockets for nutrition, phone, minipump, etc....