These 6" x 6" Leakproof Zipper Locking Bags are water tight and air tight for long-term handling and storage of specimens. Zipper Locking 6 inch x 6 inch .003 mil Bitran Series S Leakproof Bags are manufactured from durable 3-mil material which provides an exceptional vapor barrier and odor control and eliminates leaks and offers unprecedented safety and storage. Bitran 6in. x 6in. Leakproof Bags feature a double-track zipper is airtight, easy to close and are appropriate for use as a primary container for most diagnostic specimens.