In reply to Philip:
I’m new to bikepacking but have been spending a lot of time researching what to buy.
Panniers see to be less popular compared to frame bags, seat packs, bar bags and top tube bags - other than for commuting. This seems to be because you can fit them to more bikes, as no rack or mounts are needed. They’re also more aero.
Quality brands to look at are Restrap, Apidura and Tailin - all British companies. I went for a set of Restrap and have been very happy so far.