I think we should find another term for the back pack. Mine's never been near my back. To me it's a 16 litre all in one, doesn't even need wheels, goes everywhere marvel. It needs limited hose, so undoing it when it gets snagged is only ever feet away, I place it where I want it without dragging it through who knows what, & all for the cheapest price possible to go water fed poling. I have eight operatives. You can get a back pack in any vehicle. Four jerry cans & anyone can earn themselves £60/£70 & still be home for lunch. DON'T BUY WHAT YOU DON'T NEED.
I should say, I'm talking about here there & everywhere domestic work. If you've got office blocks & the like, or big easy access detatched houses then fine, spend your money so you look the part, but at the end of the day, all we are doing is spraying water on glass & moving it around a bit. I think some people want to make it look like more than it is as they are embarrassed by how simple it truely is.