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Thread either end of yellow strap through the saddle rails and round the bag so the straps clamp the bag up into the underside of the saddle, Velcro really strong & wide, no noticeable bag swing etc easily fits spare tube, mini tool, levels, patches etc more Velcro tabs used to keep the roll tight and neat. 👌🏻
(I might actually have it up side down at the moment as the strap is offset so it would sit a bit further away from the seat post)
That looks good, how does it attach to the saddle?