The standard lens hood that comes with my Nikon 600/4.0 is big and heavy, and the lens with the lens hood collapsed does not fit in any of my camera bags. That means I have to put the lens hood in my checked luggage, which doesn't always arrive. Also, the original lens hood is made of carbon fiber, and when it breaks a replacement lens hood will cost a few hundred bucks. Enter the TravelHood. It's very light, fast and easy to put on and take off, it can take a beating, and it's cheap. The best part for me is that I can wrap it around the thin half of the lens, and it will easily fit inside my camera bag. I've used it on all our safaris last year, and it works perfectly - no vignetting and it keeps its shape. Highly recommended.