I show how to use a soldering iron to fuse plastic together. This can be used to seal bags, make them to specific size of the object inside and create an air tight seal. You can make air tight bags for things like pills, snacks, or things that need to be stored. This can also be used for camping, backpacking, hiking, shipping goods, and many other applications. It is pretty simple to set up and only takes a few seconds to fuse the plastic together. It will probably take a bit of trial and error to get the exact speed right as soldering irons may heat up to different temperatures and plastics may be thicker or thinner. So there are too many different variables to give exact instructions. My soldering has an adjustable heat so I would set the heat on high so I could fuse the plastic together quicker.