Depends on what use, but I really like a vest for added insulation if it gets cold or if I sit for awhile (and thus get cold) periodically while moving, which is how I usually hunt. Not likely popular here, but I have gotten eddie bauer 1st ascent microtherm vests on sale that I really like. Very light, ez to pack in the day pack 800 fill power treated down with stretch side panels- so fit is slightly snug and layers well. Always in my pack in mtns.