Nikon HB-45 LENS HOOD includes The Nikon HB-47 lens hood

The Nikon HB-47 lens hood is used to prevent stray light from entering the front lens surface causing flare

wear them on your back

the Shootsac Lens Bag is rather meant to be a convenient on-the-job bag where you can access your lenses

with the lens pointing behind you

Nikon HB-45 LENS HOOD includes The Nikon HB-47 lens hoodThe Nikon HB 45 lens hood is compatible with both Nikon 18 55mm VR and non VR lenses. It is used to prevent stray light from entering the front lens surface causing flare. By reducing the amount of non essential light falling onto the front lens element, lenses can better achieve their optimum optical performance, producing more saturated images. Use of specifically engineered Nikon lens hoods is highly recommended. In less than ideal lighting