started with backpack, moved onto van mount, but still use backpack on quite a few jobs as it is quicker, i dont wear mine on my back though , i use it as a grab and go system, it has 15 mtrs algarde hose attached with schrader fittings , these connect to trigger on my pole , when transporting hose is wrapped round backpack, it is very flexible and sretchy, when i get to job i simply pull coils of in one go ,connect to trigger and away i go, together with van mount they are a very good piece of kit. used on its own for 2 yrs, and for the last year with van mount , so 3 yrs and still going strong, buy a spare battery if you get one, as there is no warning when it is flat , it simply stops.
daz