Please:

(1) In a rebreather with one bag, what is the usual capacity of the bag when full? I.e. how big should the bag be?

(2) How many rebreathers have 2 bags, and the breathing circulation is lungs to bag1 to absorbent to bag2 to lungs? How big should each of bag1 and bag2 be?

(3) What is the usual capacity of the bag of a diver's lifejacket (e.g. Fenzy) when full?

(4) What is the usual capacity of the bag of a stabjacket (e.g. Buddy Commando) when full?