An entire self-contained touring kit in a hip pack. Under five pounds base weight. Not expensive.
The hip pack can be attached to a bike in simple ways, with or without a rack.
There are different variations, and these videos provide a good starting point.
In the first videos he shows exactly what's in the pack,
Part 2: https://www.youtube.com/watch?v=pjHBSiievS0
Part 3: https://www.youtube.com/watch?v=bscZt8M_kAo
Part 4: https://www.youtube.com/watch?v=o3K52nCUWwU
This is the trip he mentioned in the above videos. Up to about 05:27, he discusses why he enjoys this approach, and going super ultralight,
He has a lot of additional videos and information.
And a website where he has some very reasonably priced gear.
He's a good guy to deal with. Very responsive, positive, and reliable. I've ordered from him, and am very pleased with the service. It also feels good to support the non-corporate, more individual world.
[John, if you happen to end up reading this: Thanks for all the great information and gear. And for the good vibes and supportiveness. It's great to have you aboard this ship of life. Wish I had something to give back here. The best thing I can think of is Janae's incredible smile (beginning at about 01:21) -- it's enough to lift a thousand moods: https://www.youtube.com/watch?v=isK4X-dWoGk ]