I’m using a removable barrel bags for different scenarios. The original bag I got was a T-Bag setup with the large pack and a barrel bag that can placed on top. The main bag is too big to be used daily. I don’t lug any large during my commute. The barrel bag that comes with the rig is just the right size for my daily commute gear but is not large enough for the instances I stop and grab a food to go on the way home from work.
I researched and found a couple of other bags. I’ll post the various manufacturers and models I ended up getting and in one case will not use.
One thing I have found to be limiting is the side hard bag’s capacity. I get they needed to down size the non-touring models bag capacity but it is really small compared to what I am used to.