Well not quite. I'm getting a bit fed up of filling up the backpack and as I only ever use it on a trolley I thought I'd improvise a bit. I got an old drill case and cut out some of the insides taking care not to ruin the structure so its still solid enough, drilled a couple of holes and jobs a good en. When battery and pump are strapped down its good to go. 25 litre containers rather than the backpack now and I can just swap those rather than fill backpack.