What you should know about Shelf Life  

All pouches have printed indicators that change color when steam or gas processed.

2-1/4" x 4" (6 x 10 cm) Sterilization Pouches, 2-1/4" x 4" (6 x 10 cm) for Steam or Gas Self-Seal Sterilization Pouches, Steam or EO Gas, "CE" Mark 2-1/4" x 4" (6 x 10 cm) 200/Box   Defend #MS-2512 #MS-2522 $6.15/Box $5.53/Box/Case of 40 Crosstex #MS-1102 #MS-1122 $8.49/Box $7.64/Box/Case of 40

How to read the sterilization indicators that change color when processed.