The Hydro Flask has become the must-have item here in Hawaii.  They've become so popular, it seems everyone owns one.  Wherever you go, you'll see someone with a Hydro Flask.  Whether it's at soccer practice, hula lessons, or the beach, you're sure to spot someone with a Hydro Flask. My daughters school recently sent home a letter stating that although Hydro Flasks are allowed, they can only contain water.  A few sneaky kids tried to sneak juice and soda into school!  Yes, Hydro Flasks are so popular, even the school administration is aware of them.  They've even had to make new Keep reading...