Use: A Miller's knot (also Sack knot or Bag knot) is a binding knot used to secure the opening of a sack or bag. Historically, large sacks often contained grains; thus the association of these knots with the miller's trade. Several knots are known interchangeably by these three names. Several variations are shown here.

• 
  This is another depiction of the knot shown above.
• 
• 
  This knot is also a useful hitch and is known by the name Ground-line hitch when used for that purpose.
• 
  This variation is noted as having better binding characteristics than the others.