What is the best way to: To make a pastry bag,

*use a clean kitchen towel, cut a round hole in the center with scissors, and insert the piping tip through the hole and screw on the end cap.
*use a clean kitchen towel, cut a round hole in the center with a knife, and insert the piping tip through the hole and screw on the end cap.
Answer:
use a clean kitchen towel, cut a round hole in the center with scissors, and insert the piping tip through the hole and screw on the end cap.