The flagpole base allows you to setup your flag banner indoors or outdoor. All are flagpoles and flag banners are made for indoor and outdoor use. Simply swap the flag base or add the water bag to go from an inside flagpole to an outside flagpole display! You can choose both bases to move your flag inside and outside as needed. Each individual flagpole has specially designed bases that work for the size and weight of that individual flagpole banner, you can find this information on the individual product web page.