I share his view: plastic film plastic packaging (find out all the places to buy things). The plastic film plastic packaging I used in graduation photo is beautiful and can be protected.

If you don't buy this, you can also wrap it in a fresh-keeping bag for protection, and the effect is good.

Or use transparent paper (preferably hard) to cut it into the same size as the signature piece, use a stapler to make it into a bag shape, and put the signature in it.

I think the above three maintenance methods should be good, and I hope you can adopt them. Thank you! I hope I can help you!