Perhaps each of you has faced with the fact that people you do not know at the airport ask you to carry any binding or baggage for them. Recently, social networking services are also offered by individuals and organizations to carry luggage.
Please note that each passenger is responsible for his luggage and hand luggage registered on his behalf. The carriage of your luggage is a violation of aviation safety rules, and this can have legal consequences.
Also, if you have an unidentified and unsuitable item at the airport, you should immediately inform the Security Service staff.