I just ordered one of these, I'll write up a review when it gets here.
My water is froze up right now, so we are living out of buckets for water. If I had bought one of these beforehand, we could still take a decent shower, which we are currently unable to do.
This could also be something nice to have in emergency situations when running water gets cut off.
Some of you may have seen one of these before but I thought it was interesting and looked useful. Being rechargeable via USB makes it pretty flexible and gives it the ability to be charged just about anywhere.