As a backpacker, the most important item I carry in my backpack is water. I start each morning of a hike with three liters of water; two in my bladder and one in my bottle. The water bottle looks like any typical water bottle that people carry.
I mention this because I am not a millennial. Recently, millennials have been accused of changing things around us with their quirks. One of those changes millennials have been accused of is carrying a water bottle. If they carry water bottles, so what?