Ive got three anodized waterproof aluminium dive canisters for sale.

waterproof to 150m, sealed with a double o ring

They have an internal height of 155mm when screwed together.
The bottom half is 100mm deep with an ID of 78mm.
The top half has a restriction of 72mm where it seals to the bottom.

These are actually a very serious piece of kit designed for commercial divers. Once you get one of these in your hands you will feel the quality.

This is the larger one, but the smaller one seems to sell from £100 upwards on the net -

https://www.google.co.uk/#q=Dive+Can...w=1600&bih=718

i dont seem to be able to finder this bigger one so maybe its not made anymore?

open to offers really from £50 upwards