The Whirl-Pak® Write-On Bag is a sterile, small-volume sampling bag designed for secure sample containment with easy, reliable identification. Featuring an integrated white write-on strip, this bag allows clear labeling using common writing instruments such as ballpoint pens, pencils, or felt-tip markers—without smearing or ink bleed.

Constructed from blended virgin polyethylene film, the bag offers excellent clarity, durability, and leak resistance. The puncture-resistant wire closure and continuous perimeter seal provide dependable protection during transport and storage. Opening pull tabs with non-slip textured Tyvek® ensure easy handling, even with gloves.

This compact 58 mL (2 oz) size is ideal for small samples, subsampling, and applications where space efficiency and precise labeling are critical. Bags are sterilized after manufacturing and can withstand freezing temperatures down to liquid nitrogen conditions when handled carefully.