How strong are Zots removable glue dots?

I am not even going to look to see how strong it is. If your sending something on the outside of your thing, the person would not be able to remove it if it is too strong. On the other hand if it is not too strong anyone can remove it. If you want the person your sending it to to get it put it on the inside as the post office cannot be responsible for anything on the outside. No guarantee it may just "fall" off during the trip to the receiver.