Hi! Just a heads-up. I just got a package from ECX today and the RF concentrate bottles were, indeed, leaking. Its the red-topped 10ml bottles. I see that this is a problem you are already working on, and I'm not upset, I know it must be a headache to dial in all the details of a company like this. Just hoping to help you track the issue. Cheers for all that you do! Btw, this was my first order of flavors from any company, I haven't mixed at all yet!