I bought one of these recently:
https://www.511tactical.com/range-qualifier-bag.html
It's a nice bag with enough space for a couple of handguns and a few hundred rounds of ammo.
I prefer a smaller bag to a larger one, because I want to limit how much stuff I take. Keeps me from spreading my focus too much.
The removable "ammo tote" has padded zipper pockets that perfectly hold pistols (including full size guns) on either side of the ammo bucket.
That said, I like the idea of a poster tube for holding targets...hmm.