For the minimalist. The light & fast option: Tarping. With hammock or sleeping pad on the ground. Anywhere. In the woods. In the mountains. Yes, if you know
how, even in winter.
There are various set-ups.
My main tarp is the Calgary S from Meru. It is 3 X 3 meters and weighs 1 kilo. A little less if I don't pack tent pegs and some spare guy line.
I will admit, with my new Hubba NX tent weighing only 300g more than this tarp I am not too inclined to go tarp camping at the moment.
Yes, even in winter. When you know how, there is almost no seasonal limit to tarp camping.