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Make sure the packaging tape overlaps the top and bottom halves of the plastic bottle so it can create an airtight seal. Guide the tape around the bottle and press it tightly against the plastic to seal it. Continue wrapping around the bottle 2–3 times with the packaging tape so it doesn’t come undone or break. You can also try using duct tape to help seal the bottle.
Wrap packaging tape around the middle of the plastic bottle to secure the halves.