When you're on the road, it's not always easy finding a spot to fill your water jugs (Rotopax or others). I bought this $5.00 facet/sink sprayer, cut off the sprayer head and keep it with me now. If I'm in an area where I can't easily access an outdoor faucet, I can take this into a washroom, attach to the sink and fill my water jugs quickly. No more wrestling with trying to get a Rotopax or other large water jug into a sink and creating a mess of spilled water everywhere. That all being said, I do keep an eye out for outdoor faucets and try to keep my 'tanks' topped up as much as possible!
Bonus: keep a couple of inches or more on the sprayer head side. You can jury rig a personal 'shower' system with it.