Features a strong adhesive closure for tamper evident security and perforations for easy access. They are available in 2-wall or 3-wall style that features a separate open-ended outer pouch for documents. Bags are inner packed in 100s.- Transfer Bag, 3 Wall Specimen, Biohazard, Adhesive Closure, Clear, 2 mil, 15" x 17", 500/cs Mfr. Direct