Karam stated emphatically that a human bladder contains up to 4 litres of urine

In the Karam Laws debate held in August 2010, Joe Karam emphatically states that the human bladder when full contains 3-4 litres of fluid.  He says this to support his opinion that 400ml of fluid in the bladder is so small as to be unnoticeable.  Medical journals suggest that anything from 200 to 400ml is sufficient for a person to start to be ready to relieve themself.  More about this here including audio of the incident.