Has anyone used this bag on the Rover Step Through and did it work with a bottle holder?
Didn't see a specifc bag in your post, but I have this one on our RadWagon and like it quite a bit: https://amzn.to/3jnuPwn
It's nice to have an alternative spot for a phone or a second phone. Plus you can store items that are nice to have easy access to like keys, diapers, wipes, etc. ;D
We have one of the two step-thrus that we ordered. The issue I see with adding anything to the tube that is not side mounted is going to be a pain.
I was going to put a water bottle holder on the mounting screws there but I think it's just going to be a knee buster getting on and off and potentially a ⚽️ ⚽️ Buster getting off the seat for us shorties ;)
You can consider a Rhinowalk (https://www.bikeshepherd.org/best-top-tube-bags/) top tube bag. With easy to open design; it gives instant access to all the things inside. It provides enough storage space for small items and will give enough stability once installed in the bike's top tube.