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Super soaker has some water guns with backpacks
It doesn't have water reservoir inside the blaster
And the water a filled into a backpack
There are some hard backpack like CPS 3200
it holds up to 8.5 liters of water
And there are some soft backpacks like CPS 3000
it holds also about 8 liters of water
And there are some small backpacks for kids
it holds up to 3 liters of water
Those backpacks are newer in market
The CPS 3000 is powerful as most of the CPS series water guns
It has pressure chamber of 850ml
Its output pressure is about 400ml per second
it is low weight blaster
only 1.5 kg
cause the massive water weight is on the back
CPS 3000
Water gun with backpack
Awesome