ISO a new large seat bag

[withm]

I have a largish Bontrager/Trek bag that I bought 5 yrs ago or more. I'm not really using it - I'll take a look tonight and see if it meets your criteria or take some pix and send you.

Turns out I had a photo on my phone. Does this one look like something you can use? I can measure it tonight but I think this is the kind of zipper you want, no? I am using an Arkel Tailrider on that bike now, and this would not fit with the larger Tailrider unless I could raise the seat about 2-3 inches, so I just have it sitting inside the tailrider. Redundant, I know. It easily holds 2 tubes, 2 CO2 cardridges and a gun to fire them, plus plenty of room for other stuff.