I used to have a Feathercraft folding kayak.
The big Kahuna model/. It looked much like this one, except teal:
Lightweight, and everything fit into a large backpack when packed correctely. All together with paddle, it was maybe 40 lbs or so. Kind of a pain to assemble but an absolute dream to paddle. It is modeled after the skin-on-frame kayaks of the Inuit and feels very organic in the water.
They are expensive, as they are all hand-made at their shop in Vancouver, but if you can afford it, wow they are nice. Quick, stable, and so quiet in the water.
I sold mine several years ago when some life changes meant I had no time to paddle and the extra money was going to be more useful than the kayak.