Printed bags can be made of jute, cotton, cloth, or any other affordable material that are quite easy to design and print on. For mass marketing efforts, you can order bags made from very affordable material and have them printed on which further saves you money.
For example, if you want to add a Green factor to your drive to better appeal to the growing numbers of environmentalists out there, always pay attention to what you are giving away. If you want to give away printed bags, then give away bags that are made from Green material such as jute. Other materials would apply to other marketing drives, like using cotton bags for advertising cotton shirts or other cotton based fabric. The material from which the bags are made from should be allied to your marketing campaign or brand.