The Dry&Mighty bags are built with a completely flexible, puncture and tear resistant plastic for easy storage of any product. These Air-tight, industrial-grade storage bags, when combined with one of our sealers. The Dry & Mighty bags are built with a completely flexible, puncture and tear resistant plastic for easy storage of any product. These Air-tight, industrial-grade storage bags, when combined with one of our sealers, provide an air-tight zip-lock seal to keep out air, moisture, and contaminants. The snap close top allows it to be re-opened and closed over and over. And they stand on their own!