She told my boy postage of a school bag is only $1.50 (normal mail) but he checked with SingPost normal mail is not possible because of the size of the school bag is too big. They advised postage for the bag is $6, but buyer is not willing to top up and she insisted the school bag can be put inside a NTUC bag and write the address on it and stuff it inside the post office box which is impossible to do that. Have apologized and already offer for a refund or self collection but no reply.