One of confusing things about lamp post banners is when you ask for a “double” banner.
Almost all lamp post banners are printed on both sides. But, you can also get what we call a double banner hanger like you see in the photo, where a double set of banners are displayed on each pole.
I can get confusing! What we suggest is that you tell us whether your hanging system is set up to hold one or two banners. They almost always will be double sided banners, by which we mean printed on both sides of the lamp post banner.