For handling and storage of specimens: Our patented manufacturing process eliminates leaks and offers unprecedented safety. Double-track, double-profile zipper is airtight and easy to close. Appropriate for use as a secondary container for most specimens. Manufactured from durable 3-layer laminated material for rigidity. Custom sizes and printing available. The Inspex Stand-Up Specimen Bags are packaged in packs of 250 each, four packs per case.