Disc golf mini markers are a huge help when playing with large groups of people, or just keeping track of where your disc landed after picking it up!
These are a necessity for tournament play.
Minis / Markers measure about 4" in diameter.
Picos / Can Toppers are about 2.5" in diameter. These are too small to be good for markers but they're cheap and fun to toss around. Oh, and they fit over your favorite beverage to keep it from spilling.