It saves bending and lifting and pouring water all day long refilling a Gardiners backpack up.. Plus like what Den says it fits better down back entries or drives where cars are parked up or narrow entries where wheelie bins are left plus with the P/F remote control option you safe water and again it saves you bending to switch it on and off. After a while you will just look for the easiest option that makes you work faster and make more cash. The Gardiners back pack is great I had to put my van in garage the other day and I used the back pack for 25 houses but i would not want to do that day in day out and Im very used to lifting heavy weight all day....