4. Consult someone who is familiar with the brand you are interested in buying. The person should tell you if the bag is a copy, real or a fake. Stay alert and do not believe all you hear from the vendors. People who deal with copies of luxury goods will try to avoid uncomfortable questions. Ask about guarantees and whether it is possible to return the bag if you find out it is a fake. Also, do not forget to ask for certificates proving the quality and authenticity of the bag.