Education and Communications Do plastic bags expire? Do plastic bags expire? Plastic bag – 20 years.Jul 2, 2021 Can I stamp a plastic bag? https://www.youtube.com/watch?v=IGOs22deSTE Where is the expiry date printed? Understanding Expiration Dates 1 Expiration dates for medicines are often marked “EXP” and are printed on the label or stamped onto the medicine bottle or box. Related Posts:Concrete Calculator - How much concrete do I need?How long do K- cups last?Is eXp a good brokerage?How much XP is needed for each level in the fourth season of the game.