I have alot of expierence hiking around with a hammock and a tarp. In general it is a very good solution for traveling light and having a place to sleep if needed. Get the following things: 20 meter/60 feet of 550 paracord, a tarp and a hammock. Thats all you need to build a sleeping place and spend the night. About the legality, it is dubbel. If you are on private property and have the owners consent, there is no problem. If you need to camp out on public property, search for a wooded area, make sure it isn't private, get some distance between you and the road and wait untill 7 - 9 pm to make your campsite, and leave before 7 a.m., all in the spirit of leaving no lasting impact on the area you spend the night. Open fire's are a big No No. In the picture's attached, you see some examples of my trip to the Eiffel in Germany, and yes that's all the lugage I carry on two week hikes. If you need extra info on this matter, just ask
Buen Camino!!
P.s: I am starting my camino in a couple of days, leaving from Vézelay, to Saint-Jean-Pied-de-Port, to Irun, beginning The Camino Del Norte to Oviedo, on to the Camino Primitivo, and yes I will bring my hammock, looking forward on your posts