The unique valve and seam-sealing process ensure that these bags are sturdy and virtually leak-proof, even under the most demanding sampling and shipping conditions.

• Valve consistently achieves a positive open or closed setting
• 2 mil DuPont Tedlar material is used for superior inertness and impermeability
• Patented polypropylene 2-in-1 valve has a unique push-pull function which allows the operating of bag’s valve effectively with one hand, while preparing a connection or withdrawing an aliquot with the other hand