I have attached two pics of my homemade travel rig. I only have a house scale, so not accurate to the oz, but it weighs under (probably just under) 5lbs. I prefer the hard backplate to a soft one. This rig has 3 trim weight pockets (holds up to 15lbs).
Nice rig. Just out of interest, on a small point, does the low pressure inflator hose have any "clips" to sit in, like on a conventional BC ?