Whirl-Pak™ Bags - These Nasco® signature bags are commonly used for shipping semen (for those who prefer not to use syringes or centrifuge tubes), also ideal for collecting diagnostic and laboratory samples. The Whirl-Pak™ bag is a clear poly bag with a unique wire top that allows you to close and seal the bag by 'whirling' it around itself like a jumprope. The bags have an opaque white area for writing labels to identify contents. Available 10/pk in 2 oz., 4 oz., 7 oz. and 18 oz.
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