Don't your charm thingys get in the way? I made one for mine and it lasted two days before I took it off.
I sent you a PM about that last night. It's my fault. All of my IBTanks are 19mm, except the last ones I just bought, since I didn't have a ring until recently. Don't fret - I'm sure you will get more tanks and they can be 22mm.
I like the 19mm, since they work with my charms and the Loki ring doesn't fit very well in the sleeves. Back to my pix. The mini has a 19mm (no ring) and the full size has 22mm and a Loki ring.
I like the charms. They don't fit with a Loki ring. Protanks are 19mm.