Water cooler biosphere prototypes

Last week I set about using old water cooler containers to build my prototype biospheres with multiple levels: Hydrosphere, Lithosphere and Atmosphere.

Empty water cooler containers are idea for building multi level biospheres as they fit together neatly, are large enough for creatures and come with a handle for easy transport.

I need to check out where I can get hold of lots of empty water cooler containers and also find out do they normally get reused by the company?

Photos of my prototypes to follow...