Bikepacking - a viable alternative to racks & panniers

OT: is there a seatpack/mounting system that works with dropper posts yet?

https://porcelainrocket.com/collections/store/products/albert

However a cheaper way of doing this could be to get something like a Carradice Bagman Support and strap a dry bag on.

Depends on how much drop you have as it may hit your wheel, but I guess its easily bent to fit.

Theres also the wolftooth Valais which limits your drop to the point you clamp a bag on

Depends on the setup really... Shite one yes, good one no