If you look back at the first picture, the side panel is ever so slightly angled to where at the top of the tank it is flush, but at the bottom it sticks out but about 2 mm. Enough that if you ran your finger over it you would feel it, but nowhere near enough that you’d notice it by looking at it. I havent water tested it, but would be shocked if it didnt hold water. I’m mostly just wondering if it is gonna explode on me or something haha