Impervious ProSeal™ Hamper Bags... When You Need the Top in Fluid Protection BC Textile Innovations Impervious ProSeal™ Bags combine fluid-proof vinyl fabric with ultrasonically sealed seams to offer the highest level of fluid protection. The bags retain their impervious properties for 150 processings, making their cost per use the lowest of the bags we offer. Mildew resistant, flame retardant, and OSHA and WCB and CSA compliant. Made with a straight bottom and dumping loops. These bags are available in 18" (30" x 40") 201005C Drawstring closures. Green. Our bag offers the smoothest closure in the industry, just pull the cord and the easy glide top channel closes with ease.