lol i dont meen a backpack as in a backpack that you wear, i meen a backpack as in exactly the same cheap components cheap battery crap wiring that you get in a back pack for about 100 but selling for 250 when its nothing different apart from a larger tank, you could buy a backpack take the tank off and run the inlet from the pump to a larger container and there you go, exactly the same stick it on a sack barrow