The closure of the envelope is fully resistant to heat, freon, dry ice and solvent. Once the bag is opened, VOID OPEN will appear. The words in the tape will change color once it meets water or temperature is higher/lower. Security bags offer the highest level of tamper evidence. They can be printed with customers’ logo, serial number, bar codes
Security bags are ideally used for banks, couriers, casinos, retailers, police dept's and other security agencies.