• I am seeking a bag that'll take a rain jacket, body warmer and possibly tools and some flip flops or barefoot shoes.

    Bar bags all seem to interfere with garmin and lights - my k edge mount has Garmin out front with light underneath.

  • Go for something small like the big top or one of the bigger saddle bags from wiggle/chain reaction. As Scott said large saddle bags are rubbish unless their packed full and with a bit of consideration.

    Things like shoes are likely to cause headaches when packing, I'd be tempted to lash them to the outside of the bag with a ski strap or similar.

    Bike packing saddlebags aren't a volume you can just chuck stuff in, close the lid and ride off like you'd be able to do with a Carradice or box shaped rando bag.

  • I'd go with a frame bag and some toe straps/something to attach the sandals under your saddle.

  • I've been using the apidura bar bag for audaxing. Whilst you can't get into it on the move, it is lightweight and can compress down quite nicely leaving space for your hands in all the bar positions.
    With the frame bags and saddle bags I've had bad experience with them rubbing the paint quite poorly. I'd hate that to happen to my Isen. So perhaps heli tape might be a solution to the tubes facing the bag if you decide to go for the frame option.

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