When I refused to buy a plastic bag at the pharmacy, they put tape on all the items I bought, which I found offensive.

In Japan, when customers buy items at pharmacies or convenience stores and take them home without putting them in a plastic bag, the store staff may put adhesive tape with the store name printed on it on the items. This is done to indicate that the purchase was completed at that store, and it also serves to prevent shoplifting and other problems. If you are concerned about hygiene and do not want the tape put on your merchandise, tell the staff in advance and carry out the merchandise with the receipt.