They are 100% polyester and provide a high level of fluid-protection due to the calenderization of the fibers. When transporting lightly soiled linens, these bags are Osha compliant. The bags retain their fluid resistant properties for 75 processings, which means their cost per use is very low. Made with a straight bottom, bound side seams, and dumping loops. These bags are available in an 18" (30" x 40") or 25" (40" x 35") fliptop with elastic style closure or in the chairback style (24" x 36"). Offered in yellow, gray or ciel blue. Biohazard logos are available at an additional cost. Sold by the dozen. Blockade Bags - Chairback, Yellow Fluid-Resistant Blockade Bags Are our Most Popular Reusable Hamper Bags for a Good Reason... 1 Case/Dozen; 12 Each/Dozen MPN: MDT021366