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The audax is 9L so a whole 1L extra. Not sure how noticeable a litre that would be though - audax is a small space with two pockets, whereas saddlepack is a bigger space with no proper pockets (just a mesh) so one is more stuffable and one more packable.
Re: attachment: best case is leather straps to saddle loops, or using a Bagman Sport (smaller one). You could just use leather straps to attach to your saddle rails but I suspect it would swing a bit more.
My audax comes with a bagman QR adapter and I am in the process of finding its leather straps (1 located so far!).
Hokay, and am I right in saying the Audax is the size up from that? Do you know how many litres that is and does it require a Bagman situation?