Here is the bag I had when I still had t bars, simple molle bag from a sporting goods store. Worked great for my wallet, phone etc. Since taking it off my bike, I put it on my side by side to stash the same things.

 

I bought this SDC bar bag, and it was a tad too small for my handlebars, so I made a bracket an attached the bag to my battery cover. My leg was sitting on top of it, and I could feel it. So, I centered it as best as I could on the handlebars, and it's been there ever since. I wish it was just a little bigger. It cost me $65 with shipping in early 2022.

here it is mounted on the battery cover


Here is current location

 

I have the smaller San Diego Customs. Works well and has held up very well