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I fixed the bottom strap to a bar on my rack rather than round the seatpost as I didn't like the angle the latter gave the bag; may sway a bit more with a full load but I prefer it sitting flat on the rack so there's less chance of it clipping my legs.
There are a few options for using something as an offstand for a carradice. I bolt one of these to mine, which clips round the seatpost. Or you can use something like this mounted on the seatpost.
Commute with saddlebag and nothing on my back felt so free and easy this morning (although I was still sweaty AF when I got in, but that was just going to happen on a day this hot). Nelson longflap is probably overkill for what I carry most summer days but it's nice to have the option for a bit of shopping and any potential awkward loads. I fixed the bottom strap to a bar on my rack rather than round the seatpost as I didn't like the angle the latter gave the bag; may sway a bit more with a full load but I prefer it sitting flat on the rack so there's less chance of it clipping my legs.