If you don't need a lot of tension, a quick way to secure the cord of a duffel bag or pouch, shown above, is by treating the cords emerging from the holes as a single line and tie a slipknot (slipped overhand knot) after you tighten the opening.  The pre-knotted end will prevent the loops from pulling all the way through when you use the loops to carry the bag.  Choose any knot you wish for the pre-knotted end.

Related Pages: Reef Knot Family, Boa & Constrictor Knot, Packer's Knot & Corned Beef Knot, A Cod End KnotElectrician's Braid

A Duffel Bag or Pouch Knot