"I bought this last week when on offer at £5 off and just to check it I partially filled the unit with water to see if the pump action and sprayer would leave any liquid at the bottom. It didn't, as the tube goes right to the bottom of the vessel. The wand is a separate item which is a simple screw seal to assemble it to the outlet hose and appears to be a bit fragile but in use it works very well and for storage can be clamped to the side of the unit. The pressure vessel seems very robust and the pressure pump action is easy and can be done while the unit is hanging over your shoulder via the in-built shoulder strap.
I was so impressed at this unit that I went out and bought a second and I would have done that even if it was not still on offer.