this bag be 5 '' shorter and 2 1\/2 '' narrower than the cbv12 & 15 . it also cost ... less . I buy the cbv15 which be a bit smaller and I really like it . the cbv12 be the same size but incude a detachable camera bag as part of the size . you have to decide what be best for you . here be my review of the similar cbv15 :  the great advantage of this bag be that the entire top unzip -lrb- it be actually a double run zipper which give you a wide storage space while everything stay in place -rrb- . it be great for my movie camera so I get another one for my digital still camera . I can keep 20 minus cd plus mark pen , extra battery and charger , and my bulky but essential viewing hood . when the bag open you can see everything , place everything , and when it close everything stay in place . after a year I have decide the design be probably the most convienent I have use in 30 yr .