Hi.
no , nothing like plant sprays....

they are a good way to start wfp....cheaply....
they carry around 15 litres of pure water, and the pump is 40 psi... i used one for seven months.
the thing i hated most was filling the darn thing every other house, from 25 litre drums.
i also hated carryimg around all day on my back, even though the weight was ok.... i felt like i was in the army, or a ghostbuster.
seriously , its a good cheap way to set up wfp, and some on here swear by them, even if only for bad access properties....
but i was really glad to move to a van mount....
after all.... where can a backpack go... that a thin hose pipe cant?
Gay.