Straight zipper bag is designed with no side seams, and top and bottom seams are heat-sealed to prevent leakage.Bags are made of strong grade plastic and have heavy-duty, rust-proof, nylon zippers. Our designs conform to OSHA's universal precautions regarding containment of body fluids and protection from bloodborne pathogens. Enviro-Saf bags comply with EPA chlorine-free burn requirements that allow for safe incineration. Packed in individual poly bags.