Knothead, I backpacked for most of 2 decades and didn't take the same gear twice. I always learned something on each trek either on my own or from a fellow backpacker. Your main concerns should be for dry overnight gear (tent, tarp, sleeping bag, etc...) stove and easy to fix food, and ways to purify your water. Also, good boots and extra socks and raingear and a headlamp. The list goes on, but IMO these are the top priority items. After these , you start getting into the creature comforts.