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frankenbike
Colm89
There's this thing
https://www.youtube.com/watch?v=PPR2u-qZhIk
Which one could easily bodge out of something like this
https://www.ebay.co.uk/itm/Bicycle-Cycling-Seat-Post-Back-Double-Water-Bottle-Holder-Cage-Rack-Adapter-GD/263252515042?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D51001%26meid%3Db334ac48a6b34a4b9270528c75971a91%26pid%3D100675%26rk%3D1%26rkt%3D15%26sd%3D263252515042%26itm%3D263252515042&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3A035ac7b7-4175-11e8-9da9-74dbd1803149%7Cparentrq%3Ace837a2d1620ab6ad32f0bc9fff7ce56%7Ciid%3A1
It would work with a dropper, you would just need something top stop the action to protect the bag. Something like this
https://www.wolftoothcomponents.com/collections/small-components/products/valais-25
Which im sure you could easily make out of something designed to clamp onto the post.