well, seeing as how I spent nearly 12 years or so selling and repping in the outdoor/mountainering industry, I certainly do not think I fall into "trendy".... though I do get your point as everyone has them - but no one has one under the hood like I do - but most people do not know what 'they' are all about, they just think they need one as everyone else has one.. now that being said.. thanks! the mount can be refind a bit, but it was very simple, cheap, effective and sturdy for a guy with no welding skills to make anything cooler. I do not really need that bungee as it is pretty snug fit, but I did not want to find out it was not as snug as I thought when I hit a big bump fast and the bottle comes flying out. I have had s*** in the engine bay loosen up that I never thought possible. so I added it for assurance. hmmmm.... good question. in my minds eye, I had always thought that the neck for the overflow was well below the bottom of the cap plunger. never really paid attention. but in fact, now I see it is above the plunger bottom where you would think it gets sealed??? but somehow, fluid flows in and out past this as I have watched it fill my reservoir a bit and also seen it draw from the reservoir a bit.... I thought it was a joke question you raise... but now I wonder myself.