The issue with the rack-pack for me isn't, necessarily, the roll top it's more the 3 straps that you have to undo to get anything out of the bag. Then you have to connect them all again. With luck, they haven't dropped onto your oily chain.....I know there's a side pocket but that's too small to be any use at all.
OTOH, I love how stable the rack is and the mini-panniers are excellent and they don't wobble around at all.
Back on topic: I don't camp so I don't need a tent and all the other paraphernalia but I've found that even "rigidly" mounted seat-packs cause too much sway when I'm out of the saddle, hence my preference for the Tailfin rack.
Thanks for the warning about the straps! I like the Tailfin rack but I don't like their bag as I would rather trade waterproofness for ease of access. I will try to see if I can fit a different bag on to it, one with a zip. I'm not a fan of Ortleib bags either as they seem to be obsessed with roll-tops, but I've never owned one.
The best way to cope with poor access - whether tailfin or saddle pack - is to only have stuff in the tail bag that you won't need during the day. I learned that the hard way! Also I learned to pack in a modular fashion. While you get the most in by loose-loading, it wastes loads of time unpacking and repacking everything each time you need one item. Now I have four sub-bags (one each for tools/spares, electrics, personal care/medicines and clothes).
I'm not on commission, but the Arkel seat pack really does not sway - it's basically got a rack inside it so it can't, any more than a Tailfin can. It's a really well-designed piece of kit. The rack makes it slightly heavier, and it doesn't work with a suspension seatpost (but does with a dropper) but other than that, it's miles better than other seatpacks.
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