More setup than MYOG, but I found that my new perch, Specialized Henge, has 2 screw holes at the back for some sort of bolt on saddle bag, so with the addition of a couple of screws and zip ties, it's really helped stabilise my Blackburn Outpost pack
Dodgy pic, soz.
Seatpack Stabiliser
Moderators: Bearbonesnorm, Taylor, Chew
Seatpack Stabiliser
Never knowingly under biked...