@tubetime Those pink and blue antistatic bags also have limited lifetime, generally rated at one year. The polyethylene they're made from lasts as long as any other but their antistat properties fade in a few years at most. The silvery gray bags retain their properties for 2 years or more, are more conductive and suitable as shielding, but they cost a lot more and are hard to see through. The opaque black ones are rated to last 5 years. Awesome collection. Long may it live.