These work pretty good for me.Originally Posted by esc2476
They clip onto your shoulder strap D-rings with metal clips (overkill) and then you just pop the fastex buckles to unhook and shoot. Or, use these to attach a zoom padded holster if you want full protection for your 20D. Lowepro has nice holsters because certain models open away from you, making access easier.
Having it on your chest takes a little getting used to, which might make wearing it your hipbelt a better option. If you do use these clips for the chest set-up, you can secure the bottom with an elastic cord or something similar to make it a tad more secure. Either way, it makes putting your pack on and taking it off just a trifle more of a headache. But, you'll get a lot more shots than you will with your camera in your pack!