I wanted a camera bag, so I could keep my 70-200 mm lens attached to my Nikon D7200, and this bag was made exclusively to do just that.. I also have 2 other lenses, my flash, and various other smaller items, with room for more down the road.. It is an ingenious design, and if you want a full description of this item, go their website , and they will make you a believer, that you do need this ! Quality of this , is next to none....