I am not sure I see the progression from waterbucket to camera bag, I guess the camera bag could hold water. Unless its a cooler to hold water, I don't know Lowepro, but I'll give the benefit of the doubt and assume it is a cooler. I think I might have moved that rock out of the picture unless it is holding up your bag.
People carried their cameras in buckets? :-) Basically meets the challenge, though, I'll give you that. Cleanly exposed, but somewhat uninspired composition.