This may be a little obvious, but it looks to me like your problem is that you have it opened up and you're trying to fill it like a tank. Have you tried simply dripping into it to fill? Granted, I fill mine through the drip tip but I haven't experienced any leaking issues. It seems to me that you're trying to use it in a way for which it wasn't intended. If you take any tank, clearo, etc, remove the top, fill it to the absolute brim and then try to screw the cap on - it's going to leak. While you might not get the number of drips that Vision advertises, I don't think that overfilling it and then complaining about leaks is reasonable. At worst I think the only valid complaint you've demonstrated is actual capacity vs advertised. If that's a deal killer for you, fair enough. Everyone has different preferences about how they like to vape. On the other hand, I don't see this as an accurate review of it's true functionality. Assuming that drop counting isn't your highest priority, this has been a great RBA for me. Just my opinion.