pole to pole....
do you have a van or car?
i had the same problem....
so i bought a second hand 250 litre flat tank... took the pump out of the backpack... stuck it in the van.... i even used the crap backpack battery... for a while....... connected a hose reel....
and off i went with my first van mount

..
after filling them 25 litre containers, then filling the backpack.... then humping the damn thing around all day... i was exhausted at tea time.....
a back pack is a tiny tank of water driven by a battery and pump.... which you have to man handle all day long...and keep filling.
so i thought. lets convert this into a bigger tank which i dont have to carry.
the rest of the backpack went in the skip.
hated it.