A chemical additive in these bags shields metals from corrosion by emitting a vapor that forms a protective barrier. Use them as a cover or liner to protect against dust, dirt, and moisture. Also known as gusseted bags, these bags expand when opened just like a paper lunch bag. Made from durable 4 mil thick plastic, these bags resist tearing—even when stretched over sharp edges or irregular shapes.

To pick the right size, add up the width and depth of your object, then do the same for your bag. Your object’s combined dimensions should be at least two inches smaller than your bag’s. To use the bag as a liner, plan for an extra four inches on top to fold the bag over your container’s sides.