Thank you for viewing! I will reinforce the item by sandwiching it between two pieces of cardboard before shipping. If you choose to pay at a convenience store, please send a message after purchase to let me know when you expect to make the payment. Also, in rare cases, I may have to cancel the order because I am also selling the item on other sites. In such cases, the reason for cancellation will be "other." If you are concerned, please feel free to contact me in the comments section to confirm availability.