Another option is 'bikepacking' bags; basically bags that attach directly to your frame. They are most popular in the US for long-distance rides like the Tour Divide. Bikepack.pl seem to be the cheapest.
PROS: By far the lightest system, much narrower than panniers so easy to ride singletrack, you can keep the weight towards the centre of the bike rather than hanging over the back or front wheel so they hardly affect handling.
CONS: More expensive - framebags £60+, seatpacks are £70+, handlebar slings and fuel tanks can be similarly expensive. Since it's a relatively new thing, they aren't easy to find secondhand.
I have used bikepack.pl bags (seatpack and fuel tank, DIY'ed my framebag) on a few overnighters and multi-day trips and found them to be very good: sleeping bag goes in a heavy-duty compression sack and gets strapped to the bars; tent and clothes go in the seatpack; more clothes, tools, food and cook-kit (i.e. the heavy stuff) go in the framebag to keep the weight central. The fuel tank bag is great for snacks and camera/phone.
If you're handy with a sewing machine, they are pretty easy to make. I did a framebag in a day. There are loads of guides on the internet.
See the bag that fits in the triangle, there? My brother used to live in Tanzania and they would make up stuff like that, I assume it was fairly cheap - my brother asked me to send him the lengths of the internal side of the tubes, including angles, and he had one made up for me, and brought it back, when he was next over.
It's made of quite robust kind of canvas, and seems sturdy and resilient, although it's not pretty. It was made specifically for the dimensions of my 95 DB Apex, though, so really only truly suits that frame. Something to consider using when I eventually get my ass into gear and go walkabout with my bike - I have a 2nd identical 95 DB Apex I'm in process of building up as something of a hack / bitsa build, that may be just ideal for touring. Only downsides, are the TT-Lite frames and forks from that year don't have any eyelets or mounts for guards or racks, anywhere (even the seat-stay bridge doesn't have the normal hole through it).
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