All this talk of snaring rabbits. A deer would be far easier provided you had the cable to hold one. Aircraft cable would suffice. It doesn't rust. Make a loop in one end and use a mashed nut to hold it in place. This will allow you to loop it around a tree and feed itself through the loop which will hold it around the tree without additional measures. A bent washer with two holes drilled to secure the cable completes the snare in a manner which it will close very easily. If you want perfection a bobby pin can hold both pieces a cable until the appointed time. About 3 or 4 feet of cable will suffice. It is very light and sorta/kinda compact (but not fit in an altoids tin). A smidge of fishing line to drop from a branch to the desired height and a very small stick from the ground up to the bottom of the snare will guide the head. Set in a runway it would be very effective. Simple. Again we are talking worst case scenario right :question At least you would have plenty of food ;).