fold the top of the bag down about 2cm/1in. Do this 2 more times.
take the corners of the folded part and fold them toward the middle of the rolled part at an angle
the tricky part. We are going to invert the cuff we've made - like flip the folded part inside out. Push those corners in and flip the folded part over them.
https://doitandhow.com/wp-content/uploads/2016/12/tumblr_o4t3u1lyfa1qkvbwso1_r1_500.gif
take your open chip bag
fold the top of the bag down about 2cm/1in. Do this 2 more times.
take the corners of the folded part and fold them toward the middle of the rolled part at an angle
the tricky part. We are going to invert the cuff we've made - like flip the folded part inside out. Push those corners in and flip the folded part over them.