Good pack that fits right. Exo, stone glacer, Kifaru some thing with load lifters eberlestock are junk. Good boots that fir right and learn were to put leukotape on your heals before you get hot spots and good socks darn tough and always a spare pair to change out when you stop to glass. Good clothes that are light weight and can be layered. If sleeping where you could get wet a synthetic bag is heavier but you dont loose insulation when wet if wet isnt a concern a good down bag. Water filtration and make sure if its going to be cold enough to freeze you dont let it freeze. Then the most important part is being ready to be kicked in the nuts again and again and be comfortable being uncomfortable.
If your spiking in and then shelters come into play and that a whole nother can of worms.
Go to rokslide and you can find good deals in the classified and get a bunch of info