Cutting utincils, scissors, exacto, razor etc
clip, pant hanger, cloths pins
Lay bags flat one on the other you will cut through so do not layer too thick. Clip the bottom of the bags together and holding them flat cut off the loops. Continue cutting loops up to the clip; they should be between 1 1/2 to 2 inches.
After you have lots of loops hook them together with a larks head knot. Pass one loop through the other and pull the loop through itself. Make snug repeat.
Example of larks head.