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I have this: https://theradavist.com/big-x-tops-mini-saddle-bag/ its quite nice and I got it for a fiver, I dont think he makes them anymore.
But maybe this? https://alpkit.com/products/enduro-seat-pack-and-harness-bundle
Or just any 2-3L dry bag and a voile strap
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https://bigxtop.com/products/mini-seatpack he do but they're a lot more expensive these days.
It's a great size though. I really love mine.
What’s the best, minimal, tiny saddle bag? Just want to carry a stuffed jacket really. ~0.5l