The venting allows evaporation of moisture and prevents cap corrosion and potential of contamination by organic growth. Developed for products that have long shelf lives, are shipped to humid destinations, and/or slated for overseas shipment or extended storage. The perforation system is an easy retrofit to existing packaging equipment, including PDC’s tamper-evident neck banding machinery, shrink sleeve labelers and multi-packers. It operates at line speeds up to 400 bpm with sleeve diameter capacity between 1.5 in. and 7 in. Works with PVC, PETG, OPS and PLA films.