lengths of air bottles?

[>humantarget<]

Im looking to upgrade my steel bottle rolleyes:yeah i know, but im still a noob) for a carbon fibre jobbie. My steel bottle is a nice length, which fits nice in the shoulder and the gun feels comfortable. The problem I have is that I would like a 0.8l/4500, but the length is too short. The gun is too close and doesnt feel right, and the 1.1l/4500 feel nice in the length but make the gun too back heavy, unbalanced. So what im trying to get at is, are all bottles the same dimensions? Is it something im just going to have to adapt to? Do different makes of bottles come in different sizes, shorter but fatter, longer but thinner etc?
I should say that I have looked at a few bottles down my local field but they are all GI sportz (0.8l and 1.0l)
I hope my ramblings and waffling makes sense to you all.

 

[Anotherproblem]

There are different shapes and sizes but you could get the smaller one and an extender like this

http://www.rap4uk.com/High-Pressure-Air-Regulator-Extender-p/ga_reg_extender.htm

 

[Tom]

All shapes and sizes. You are best getting hands on at a retailers shop or an event

But there are other options such as drop forward turned around to a drop backward, rail mount ASAs and many more

 

[F3Z]

If the 1.1 is the right size but too heavy then take a look at the ultra light tanks like the stako or fuels. These things weigh less than you average carbon .8 so should give you the best of both worlds.

 

[frenchy2475]

Fuel supra lite 1.1L is the way forward, lightest smallest 1.1 L tank availiable. I suspect it will be the perfect length your are after too.
http://www.bzpaintball.co.uk/product.php?p=Fuel Supralite Air System with Ninja UL Reg&t=Air Systems