The Barrel Sling, or Barrel Hitch is made by tying an Overhand Knot, leaving plenty of free rope at the working end. Where the rope crosses itself in the middle of the knot (near the target), grab the strand of rope on top and bring it towards you, then lay it back down.
The result should look like step 2: note where the target is. Place your object on top of the diagonal strand of rope in the center of the knot. Carefully draw the rope up at the working and fixed ends, forming the “sling” around the object. Tie the working end off using a Bowline, making sure the sling is tight around the object.