Obviously carradice springs to mind as the main option. But you could use something like this:
https://www.alpkit.com/products/airlok-xtra-dual-20-litre
swap the straps for ones that fit saddle loops an get a support?
That's a good idea actually, I have a 13l one of those already that I've been using on the bars but it's been kind of annoying me how it gets in the way of my hands in a few positions. Will look into that, thanks.
I think this guy does roughly that in combination with a handlebar harness
@TheSchwartz started
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Obviously carradice springs to mind as the main option. But you could use something like this:
https://www.alpkit.com/products/airlok-xtra-dual-20-litre
swap the straps for ones that fit saddle loops an get a support?