For my APSC camera actually not necessary. Belt with offer no significant additional carrying options (possibly Were I with a big SLR but grateful, because with something like the belt would not ProPad safely under the weight of twist, with ProPad no problem) and the backpack straps, I find it rather disturbing, as clunky. Maybe with very thin straps, but then you have to also keep in mind that a very light backpack is hanging askew from the weight of the camera. Very handy are screw in the provided long, so I can mount (without the ProPad) also attach to the trekking rucksack.