The Ashley's Book of Knots #388 - #390, the bag knot, sack knot or miller's knot. Make tying a bag or sack shut look cool! A fun knot for gift wrapping, tie that bag with wine in it shut with a bag knot.
According to Ashley"s the names of the bag knot, sack knot and miller's knot are all the same interchangeable.
Many millers use a round turn with the ends reef knotted or else secured with with a drawknot or half bowknot. Some use a slipped clove hitch, which is the least practical.