I've been hiking the white mountains in NH for 25 years, and have done numerous 10 - 30 mile multi day hikes. I keep simple backpack setups for summer or winter hikes.
My pack and gear is as light and minimalistic as possible, if I don't use something I leave it home. I spend the night on the mountain on occasion, and I carry what I need to survive overnight every time I go deep in the woods. if you've never spent the night out there, I suggest you do, just to take the mystery out of it.
I carry a hennessey hammock, a small but quality $$ sleeping bag, space blanket, small first-aid kit, fleece top and bottoms, rain top and bottoms, socks, jetboil stove, water filter, a small amount of water, food, maps, navigation tools, and of course - a handgun. pack it all in a heavy duty trash bag inside a lightweight pack and your good to go. it all probably weighs in at 25 - 35 pounds depending on the season.
I've walked through swamps, woods, and mountains all over new England with a small pack and a long gun (hunting) and i cant emphasise enough how carrying extra weight ruins an outing. (we wont get into getting lost out there just yet...)