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@Bearlegged
The Alpkit tapered drybag. OK, but isn't as structurally stiff/rigid as more 'standalone' seatpacks (it's designed as an inner bag really).
I've got decent results by:
1) Make sure the narrow end (where it attaches to the seatposts) is really tightly packed. Use small items like socks, pants etc to really fill the space.
2) Stiffen the bottom of the bag. I use my folding bowl for this.
3) Using lots of velcro round the seatpost, going through as much of the daisy chain webbing as I can.