The digital holster 30 v20 is the only top loading bag for a dslr that can carry a 70 200 f28 with the lens hood either reversed or in position ready to shoot designed for regular sized dslrs such as the canon 5d mark ii 7d and 50d or nikon d700 d300s and d90 the digital holster is also compatible with the digital holster harness v10 and v20 and the think tank backpack connection kit