Oh, it occurs to me that the "Sam Browne" stud may be a rivet-style installation, while the "button stud" (a couple entries lower on that same linked page) appears to be a threaded arrangement. Seeing that, I'd go for the "button stud" even if just as an experiment. The prices are so low that you can probably get some of both and see which works better for you.
It's funny, I wasn't a big fan of the Big Box throughout the time it was available. In retrospect, though, I can see the appeal. I lived with (to some extent, "in") a SaddleSack Large for quite a while and found the massive capacity was handy. However, the Medium has advantages too; I'm very happy with it. But we'll see if winter (and all the layers it requires) teaches me anew the value of the Large's spaciousness.
Yours,
Thomas Lynn Skean