Full Size USB Adapter
This last one might be a bit confusing, but it essentially turns the micro-USB port on bottom into a full-size port that owners can do a lot of things with. Plug in an xbox controller for enhanced gaming, or even plug in a 128GB USB stick full of videos and music for a long trip. The Note 5 doesn't have a micro-SD slot, so this is the next best thing to temporarily increase storage when you need it.
This is also a handy way to check the photos you took with a DSLR or point and shoot or to watch a movie you keep on a USB drive and only want to watch while on a flight.