Not joking.
I never use water bottle holders-except to hold a battery.
I should have been more clear-the aero/art deco curve on top made it look like it MIGHT be closed on top.
It looks like those aero locomotives from the 30's 40's- or a Republic Sci Fi space ship from one of those serials (Commando Cody etc)-
yeah the designer spent some time on it-
it stands out-not pure function


Of course it wouldn't make sense to not have it go in from the top...but