It's the 3ml pictured. The 5 ml is pretty fat. The 5ml looks wicked on an omega or bullet, but looks a little top heavy on a go-go. I vape all day, and the 3ml lasts the whole day. I was having to top off my go-carts in the early evening, but dont have to do that with liquinator tank.
I can see why the tank gets such good reviews. It's a genius design, and at $25 its no brainer. Not to mention it's dang near indestructible. I ended up getting one for flavors, and one for tobaccos. Works out awesome.