Strong polyethylene bag features a unique specimen security system with a positive closure that is guaranteed leakproof when properly closed. "Puncture-proof tabs" cover the wire ends and protect the bags against piercing. Includes OHSA compliant biohazard symbol and paperwork pouch. Nominal bag dimensions are 6 x 9" with a 5 3/8 x 5 3/4" paperwork pouch. Bags are 2.5 mil thick. Pack of 500.