So just to follow up on this,
@dmg5000 's water tank is 50 liters.
The water inside will weigh 109lbs or 49.8kg
The tank weighs 11 lbs.
Total full weight about 120lb.
I once weighed my full loadout and it was ~190lb. Meaning 460lb total (with GFC’s quoted camper weight). I imagine most folks run heavier loads than that, especially including a passenger.