Whirl-Pak Write-On Bags (qty: 500)Whirl Pak Write On sample collection bags provide an easy to use leakproof closure for collection of a wide variety of samples including milk, grains and soil. The white, write on strip makes sample identification easier and more convenient. The paper like finish of the strip allows the use of ballpoint pens, pencils or felt tip markers without smearing. Convenient write on strip for easy sample identification Perfect for all sample types Classic