I use this bag every day I go to work. (Even if I dont ride) I just got in the habit and it works for me. It's the Bags Connection City. It's really handy. It can fit a normal guys size wallet, personal keys, work keys, 2 large cell phones, multiple snacks, a glass Tupperware container, ear plugs, fuses and a bunch of other stuff.
It's really well insulated in that I can ride in the upper 100s F and it keeps my food and drinks cold. And I modified mine to be smoother on the bottom so it doesn't skuff the paint.
I'm probably one of the only people on here that doesn't like the look of a top case on the rear so this was my better looking alternative. And it's actually really nice to lean on for long trips and takes some weight off your back.
My bike is apart for paint work so I took a picture of the adapter to the gas cap. The cap still opens and all you have to do is pull the release tab and it comes unhooked. Then you can fill up and snap it back into place. Super easy.
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i use this shad tank bag. Very easy to install and east to remove when needed. I had to use the same ring hardware listed for thriump motorcycles, perhaps you can look for that ring.