In the wilderness I often duplicate essentials and have whomever I am with carry them along. Some things such as bandaids, and aspirin and so forth are for sharing. My 10yr. old carries an emergency blanket, mirror, and now firesteel & tinder, a small Swiss army and a lanyard held photon light and whistle in addition to trail gear in a pack. The lanyard is "always, always on.
In a true survival situation I figure what you have is what you have be it myself or others and for me the smaller and lighter it is the more probable I'll have it so things like eating utensils are out.
I have to say, in the great outdoors, if you need it and I do not you've got it. If we both need it we will just have to share.....