Ah sorry about that, didn't finish reading your post.
This thing is what I use, and it can easily hold a weeks worth of vape gear if you want it to.
Its turned into my tactical 'man purse' essentially.
Fatty Pocket Organizer
Expensive? Sure. But the build quality is unmatched in anything similar to it I've seen. I wouldn't be surprised if this thing is still in perfect condition 20+ years from now.
They offer smaller ones too, that'd be good for a night out. But the eGo cases I find good for that.