the patented intervoid sterile bag of coveris flexibles in winsford is a multiindustry sampling package innovation that combines ultrasterile, ultrasecure, composite sampling systems for the first time.the intervoid sterile represents a major breakthrough in flexible packaging for medical, food, and other specimen sampling through its highly technical conversion methods.the sterile bags combine unique track & trace identification, patented tamper evident closure and tape, perforation, secondary gamma sterilization and leakresistant properties to deliver a composite, sterile and easytouse sampling solution for enhanced safety, security and environmental impact.eliminating the risk of cross contamination and enhancing traceability and function, intervoid products are both food contact approved and un3373 marked for product assurance and security against cross contamination.