well a tank bag might be an option. they make ones that you actually install clips under your tank mounts front and rear so you clip it in. alls good. I like having stuff infront of me just incase it moves. Im not saying go buy one but you can get straps and clips just about anywhere. Probobly a craft store and im guessing your back pack has a few. You could also tape some heavy duty magnets inside the bag but i wouldnt want to mess up your tapes for the camera.