The Whirl-Pak® Write-On Bag, 384 mL (13 oz) is a compact, sterile sampling bag designed for secure collection, transport, and identification of small-volume samples. Its integrated white write-on strip allows clear, smudge-resistant labeling directly on the bag, supporting accurate traceability in laboratory, food safety, environmental, and field sampling workflows.

Constructed from blended, virgin polyethylene film, this bag delivers excellent clarity and strength while remaining FDA-approved for food contact. Puncture-resistant wire closure tabs enable fast opening and secure sealing, while the continuous perimeter seal provides dependable leak protection. Post-manufacturing sterilization ensures sample integrity across a wide temperature range, making this bag suitable for refrigerated, frozen, and cryogenic applications.

Ideal for tight sampling spaces or limited sample volumes, this 13 oz size is commonly used for grab samples, retention samples, and routine testing where compact handling and reliable identification are essential.