My framebag advice (having made a grand total of one) would be not to make it too wide, i find mine bows out a bit and i get a bit of rub against the chainring occasionally.
Could you add internal velcro or rubber straps that pulls the sides in?
@moocher started
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My framebag advice (having made a grand total of one) would be not to make it too wide, i find mine bows out a bit and i get a bit of rub against the chainring occasionally.