Forgive the length of my post, I just wanted to say a few things......
I have always been a do unto other as you do to yourself type person. I attached a tens unit to my genitals before I asked my wife, and I experimenting in omorashi LONG before I ever asked my wife. It is something I have been doing for almost 15 years now..... but not exactly as is shown on this website. The area I like to play in is the limits. I hate drinking a lot of liquid, or waiting for hours until I am extremely full..... so I started to cheat. In doing so (along with a lot of research) I was able to find out quite a few things.
There are 3 types of bladders..... an empty bladder...... a half full bladder...... and a full bladder. Most people believe their bladder is full when in actuality it is much closer to the halfway point. The average bladder is FULL somewhere in the neighborhood of 1500ml. What most people consider themselves as "full" is somewhere around 800ml. A person will tell you their desperation i a "9" when in actuality it is a 5.
i would imagine most measurements on this site have been in the 800-1000ml range, because that is the point where the signals sent to the brain are the strongest. Once you get past a certain point, it is easier to hold the liquid because your body puts more energy towards the goal, sometimes too much as we saw here and Cheyenne had a hard time letting go. When a person's bladder is truly reaching it's limits, then that person will not be able to stand straight up without feeling their own skin compress on their bladder. Watching this video, Cheyenne was much closer to her actual limit than Carissa was. I would venture a guess that Carissa could have actually held another 300ml before she reached the point of desperation that Cheyenne was at.
Once you go past this point, you reach a level where your body is literally doing everything it can to hold it in, and taking energy away from other areas of your body. Has anyone ever ridden a bike so hard, that standing on the pedal your leg starts to shake uncontrollably? Your legs will also do this once you are right at your absolute limit. No matter how much you try and stop it, if you don't stand flat on your feet, your leg will shake.
I started off small..... the "delivery" container I used was small, and it took a long time to force liquid into my bladder (through the urethra). If you give a gentle push like your trying to void, then liquid goes in just as easily as it comes out. I would NOT however suggest anyone trying this, even if you have a monster immune system like mine (0 infections in 10 years of this). I eventually moved on to large size syringes I was able to steal from this place or that. Not with a needle, but just a hole at the end, like a turkey baster. Even these though held at most maybe 100-150ml of liquid at a time, and everything from the tip of the urethra to the bladder doesn't go in. So I moved from this to that, till I found an adapter for my sink, that would turn it from a regular sink into a water fountain. That worked VERY well for a long time because I could adjust temperature from really hot to really cold in order to send different messages from the bladder to the brain and ultimately hold more liquid. Also... cold liquid shrinks the bladder, and hot has the adverse effect.
Anyway.... this eventually lead to the ultimate delivery system, found almost by pure accident. lol, don't turn your nose up in disgust too soon..... it really isn't. Anyway.... in the upper deck of your toilet, there is a small hose where the clean water from your provider comes to fill the toilet when you flush. If you remove the close end of that, it can be used as a delivery system. I always used an alcohol swab to clean the end of it before I used it, and the water is just as clean as tap water. It took a while the first time...... it is a rather scary prospect....... but the water that comes out is sooo much colder than out of your tap because it has no temperature regulation at all..... and it comes out pretty fast. So I finally got up the courage, held it tight to my urethra(as it would never fit) and flushed the toilet. It really is an experience that's hard to describe...... ice cold water flowing into my bladder fast enough that I can visibly watch my bladder fill looking down at it. Watch the skin get tight and the bladder balloon almost faster than it can send signals to the brain. I found that 1 flush delivered roughly 1200ml, so I started holding down the handle for a few seconds to make the flush last longer, cause once the top is full the water stops flowing, and it doesn't ALL come through the tube. I finally found a way to fill my bladder to the brim in under a minute...... and if I pressed my forearm to my lower stomach, I could feel that it was cold as my bladder was pressed right up against the skin.
I would love to post a video of it someday.... by I just moved and the house I am in has newer toilet with too many holes before the hose so there isn't enough pressure to accomplish. I don't have the accuracy of Dave's graduated cylinders...... but I have personally filled a standard 500ml measuring cup 4 times with excess fluid left over..... so my max capacity has gone past 2000ml. Actually if anyone has any questions about things they want to try, let my know, I have probably already done it and can let you know. For example....lol, filling your bladder with air doesn't feel the same. Because you have no actual weight you can stretch the bladder much further, but it just doesn't feel the same. However..... filling your bladder to bursting with liquid, then inflating a balloon in your rectum can create some INTENSE desperation VERY quickly. Pushing on the bladder from the outside is NOTHING compared to pushing on it from the inside from the outside it has places to go, from the inside it is trapped by your skin. Also, another experiment...... filling your bladder 80% with cold water, then the rest of the way with air can create a VERY nice sloshing effect when you bounce...... DO NOT however push on your bladder if it is full and at a higher elevation than your kidneys, the fluid WILL backtrack and leave your kidneys feeling heavy and no functioning at 100% for the rest of the day(fluid sits in stomach longer). Like I said though, if you have something you have thought of trying, let me know, I could try for ya or might have already done it.
In all my research both medically and on myself over the years, I have found A LOT of things out about the human bladder. In this video, it was clear by halfway in that Carissa had the larger bladder and would easily win as long as she did not give in mentally. I was actually surprised that she stood upright for almost the entire movie, her capacity is quite impressive for a female, no shock that she wins every time. Cheyenne started to stand on her toes late (Something involuntary I think) but her leg never started to quiver...... is a shame.
Dave, if you had added another bottle at the 1 hour mark, Cheyenne would have folded LONG before she did.
ANYWAY..... sorry for the long post, not a topic I really get to talk about much. In fact, I have only ever talked about it twice, both times on the internet to a very select/small group.