Easy to carry and join together to for a large backdrop, available in upto 7.5ft height
L banner is called L banner stand as it uses a top and bottom bar to display a graphic with the use of a vertical pole which is held and supported by a bottom weight. This formation when seen sideways looks like L shape due to bottom weight and bottom bar forming a L as seen is picture below.
its advantage is that many stands can be co-joined to form a larger back drop
Disadvantage is that unless the bottom weight is sufficient , L banner stand tends to be unstable.
It also requires assembly. Many separate parts make up the stand and if anything is lost in transit, banner becomes unusable.