input question: To store a flag in the Winter when not using it.

output answer: Fold the flag properly and put it into an old cereal box and then in a bigger box.

input question: What do I do with it afterwards?

output answer: Put it into a paper sack and throw it into the trash.

input question: How to pierce mason jar lid.

output answer:
Use a nail and hammer to pierce a hole in the middle of the lid.