There are marks from overlapping on the back. Trading cards and postcards will basically be packaged with cardboard reinforcement on both sides. Sleeves and waterproof measures will also be taken. Since I am also selling on other sites, items may suddenly become out of stock. Please comment if you would like a hard case. Discounts are available for bulk purchases of trading cards. Price negotiations are possible only if you can buy immediately, but I may not be able to meet your expectations for items with many likes or that have just been listed. #OnigiriStrayKids Group Name: Stray Kids