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turns out @umop3pisdn was right
Swings uncontrollably no matter what I try, zip ties, strapping it tight..
Maybe I'll get a proper harness and use the airlok as the contents
https://www.alpkit.com/products/airlok-xtra-tapered
13L drybag for £21 with just enough strapping to pretend it's a proper seatpack, but not so much that it takes ages to fit and remove.