So, that would be a little over 18 liters? That IS impressive!
Or does that include the weight of the bladder as well as its contents? Lessee, Internet click click scroll click about 13 to 16 ounces for a normal human bladder. This couldn't be a normal sized bladder, then. The density of the human bladder is 0.6 ounces/cubic inch topologically arranged as a hollow conventional ovoid...I'll leave that as an exercise for the reader to figure out how much urine a "forty pound bladder" can actually hold.
Hi Tom!