apart from the "rub" and the overall problems with understanding the posts, i would say it sounds awfully small for an adult BP.

my experience (i am metric) tells me that 24.5 liters is not much, and my online unit translator, which can deal with multi-dimensional unit conversions (wolframaplha) tells me its 6.5 gallons in volume. that sounds rather small for an adult.

if modeled into a perfect cube, this volume would translate into a cube of edge length: 29 centimeters, or 0.95 feet, or 11 inch. thats tiny.

so the answer is clear: its too small