I recently purchased three new enema bags. One of them is a black silicone open top bag with a fairly large bore hose. The bag is a rather standard design and the bag's nominal capacity is 4 US quarts. But the fact that it is black rather than clear is quite an exciting difference. It came with a carrying case and a selection of nozzles. When completely filled it measures out at about 4.5 liters or 4.76 US quarts. But the really big bags are a different open top design.
These two bags are both rubber latex. One is a yellow latex rubber (translucent so that you can see the liquid level in the bag) while the other one is black latex rubber (can't see through it, so I have to guess the remaining liquid level by the shape of the bulge of the hag). Both use what looks like a heavy rubber grommet to attach and suspend the bag. The nominal volume of each of these bags is 5 US quarts. Like most bags larger than 4 quarts, the actual holding capacity is larger than the nominal volume and these are no different. What is very different is how the capacity changes with the temperature of the solution. Using lukewarm water, the bag capacity is roughly 5.2 liters (5.5 US quarts). With water on the very warm end of the temperature scale, the bags are a little easier to stretch and the capacity increases up to just over 5.4 liters (5.7 US quarts).
But the truly interesting change in capacity is when hot liquid (too hot to take as an enema) is poured into either of the bags. Last week, I decided I wanted to take a rather large coffee enema and it took a little over three pots of coffee to fill the bag (true for either bag). Each pot is 2 liters and so filling the bag to capacity is over six liters of hot coffee. Of course, it takes a while to cool that much coffee to a usable enema temperature so I have to allow time for that. But the capacity of the bag doesn't change as the coffee cools. The higher temperature of the coffee enhances the elastic characteristics of the bag so that it stretches to a larger capacity. And believe me when I tell you that it is very difficult to take a 6-liter enema even if I am well cleaned out to take a large volume. But it is fun trying and that capacity allows me to split the large single enema into two enemas . Oh, and the bags do return to their normal capacity when I go back to normal temperatures.