Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make a duct tape backpack [title] Cut a piece of duct tape 15 inches long. [step] Lay it down on a table, sticky side up. Continue to cut multiple pieces of duct tape that are 15 inches long.

Ending1: When you have your cut pieces, tape them onto each other. [title] Connect the duct tape piece to an absorbent material, like a pvc tube or compressed air pipe. Ending2: They need to be equal lengths in order to fit on your backpack. To cover the whole backpack, line up each piece in turn with the rectangle you already made in step 1. Ending3: Each time you cut a new piece, lay the non-sticky side onto the sticky side of the duct tape already on the table. Overlap the pieces about 1/2 inch. Ending4: [title] Fold the ends of the square of the square so that they meet in the middle. [step] The two sticky ends should form a symmetrical crease.

Answer format: ending1/ending2/ending3/ending4