Lens Cover

Small  : fits in for macro 105 mm lens , 70-200 , 100-400 lens.

Medium : fits Telephoto lenses like 150-500, 150-600 , 200-500, 100-400

Large : for prime lenses like 400mm, 500mm 

Extra - Large :  for prime lenses like 600mm, 800mm , or Prime lenses mounted with Adaptors or teleconverters