These bags have been chosen for their ability to rival any reclosable bag at economical prices. It features a preprinted biohazard symbol and check boxes for processing, and a third wall outer pouch to keep paperwork separate and uncontaminated. These tough bags employ a reinforced side-welded zipper to lock in single smooth motion. Made of 100% virgin Low Density Polyethylene (LDPE) resin, these bags meet FDA/USDA specifications.