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DIY Jet Pack for HOURS of fun! Step 1: Spray plastic bottles with plastic primer (I used Krylon Fusion). Let dry. Step 2: Spray bottles with your favorite silver spray paint (doesn't have to be plastic specific.) Let dry. Step 3: Adhere bottles to a piece of cardboard, approximately the width of the bottles next to each other. Let dry. Step 4: Use ribbon to create backpack-like straps. Adhere. (I used duct tape. That shiz works for everything!) Step 5: Cut crepe paper str...