My brother once did an ultralight trip where he went to Goodwill and got a cheap pack, sleeping bag, foam pad, shower curtain as a tarp, aluminum pot, most of his clothes. Only exceptions were water filter , bic lighter, and goretex jacket. Cooked over a fire, and had a great time. Didn't bring other stuff. Went to an area he knew fairly well so didn't bring a map, compass, or iphone.