If you care sandwich bags 48sour highly popular if you care unbleached paper snack and sandwich bags are made exclusively from the unbleached pulp of scandinavian spruce trees ndash a natural renewable resource if you care snack and sandwich bags are not treated with petroleum based paraffin wax or any other wax the pure wood pulp is specially ground and pressed to form a natural barrier that prevents grease or fat from penetrating making them ideal for sandwiches that use mayo or oil