Sometimes older solutions are better. Carradice went with the Bagman following the demise of Karrimor. (I have a couple) These are fine as a solution in many instances but for me I would like to employ saddle hoops for audax runs. These bits of kit are simple and just work and allow you to walk away easily with saddlebag.
They still haven't sorted bag hoops for the Pro or Swift both beautiful saddles (although currently using new Pro for knocking nails in!). Cyclists filing hoops off saddles 30 or so years ago for weight/racing purposes, I can understand, but does it make sense for today's market? Whilst we are at it. Titanium versions of the Pro have saddle loops - outrageous.