Aside from the obvious (insert favorite gun, knife, etc.) I too am a big believer in the wool sweater. My lucky sweater is this ugly green zip neck item, a gift from my father, made in England and excellent quality, but apparently most unfashionable. My wife, ex-wife, ex-girlfriends, all have forbidden me from wearing this hideous thing in public. It has, however, saved the day many times over in the field. Not just for myself but often for others in my party who came unprepared. Not super heavy but still quite warm and packs easily so it’s in my day bag at all times of all seasons. From an extra layer in winter, to colder than expected nights in the mountains, or quite unexpected swim tests in cold waters, this ugly wool sweater has truly proven its worth.