Collecting rain water may seem to be a waste of time, but rain water has many properties as it can be used for drinking, washing and watering the garden, the best thing is that is free and virtually pure.
However collecting it in a useful and practical way is another matter, this is where the water hog comes in, and these are a practical and safe way of collecting your rainwater.
Each Waterhog has a capacity of 183 Litres. The external dimensions of the Waterhogs are 1800mm x 500mm x 220mm.
Source [Water Hog]