The largest front bag that fits the flat bars is the ortlieb one. There are other bigger ones but you then need the ugly bars.
I got the ortlieb front bar bag and the seatpost adaptor and stuck it on the back - works well - it'll also fold with the bag on.
@clefty started
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I got the ortlieb front bar bag and the seatpost adaptor and stuck it on the back - works well - it'll also fold with the bag on.