My ideal vest would have a few pockets up front and an game type pocket in back. I'd use that to carry a small bladder type water container. It wouldn't be an added layer of insulation and might be made out of something like the 4 way stretch material Kuiu uses. It would have to carry maybe 5 pounds of stuff. I'd use it for short duration hunts when I'm not going too far from camp but still want to carry some essentials.
Sort of a hybrid vest and pack.
Thanks Laro, I'll check it out.
Stinky, I went to Cabelas and looked at theirs, kind of overdone with too much insulation and weight.