are people still using these

?
cant see the point nowdays- we gave up on backpacks 8 years ago
just get a tank in van/car , as you already lugging the water round , a pump , 100 mtrs microbore ( there's nowhere you cant get to with100mtrs !! ) . less hassel
even the cost is a no brainer - all them 25 lt's container's you can by a tank , the backpack price you can get a pump , so you left with just getting the microbore !!
all the other bits you will be using anyway