i still cant though, i cant imagine holding less than 50 litres, i cant see the point in using a backpack unless it just comes out the van every now and then for difficult access stuff etc, but if you want a portable system i would go for a trolley, hold more water and it would suit this guy in soft water area to have di on would make life really simple, then i would suggest he covers his bases for access issues by either getting a backpack as well or a length of hose, ?
sorry mate not tryin to sound funny jus not seein the backpack way of life, looks like a big strain on body etc, then people say jus stick it on a sacktruck and that makes me think you might as well have a trolley
