The can, in addition to being a container for survival supplies, could be an improvised kettle for melting snow and heating food. Before filling the can, punch three holes around the top edge of it in a triangular pattern. This Kit should be kept in the interior of the car if possible. Your trunk or door may be jammed by collision or buried in the snow, making items in the trunk inaccessible. Also you can cut a hole in the bottom large enough for your head and wear it as a poncho.
Batteries work best if they are warm.
Tape coins under the lid of the can for use in pay telephones. A small roll of duct tape. Remember that the stored can and its contents may be frozen and thawed many times before its needed. Do not put in items which can easily melt or freeze and burst open. In addition to the above items, mittens, scarf and stocking cap may be wrapped around the can with 30 ft. or more of drapery cord or strong nylon string.