I take a lot of photography trip on weekend . one thing I like to do be to leave my 70-200mm or 100-400mm lens attach to the camera , on top of the photo bag in the passenger seat of the truck while I drive in rural area . if I see something of interest , I stop the truck grab the camera , get out and take some image . that be what attract I to this product . the issue with this bag be that if you have a lens with a lens hood , the lens will not fit in the compartment of the bag , and still be functional as be advertise -lrb- and as I describe above -rrb- . I have a 24-70 with lens hood , a 16-35 with lens hood , a 70-200 with lens hood , a 100-400 with lens hood , a 100mm macro with lens hood , etc. . these lens do not fit in the bag , with the hood invert , if you want to carry you camera across the top as picture . I try to make it work , and end up return the bag .