I took my test about 2 weeks ago. And i had no problems i used two bottles of quick fix rubberbanded together with the heater on the side away from my body. practice with these two bottles in your crotch. and wear an extra pair of underwear. play with the position of the bottles to find the best spot where it will go unnoticed to a pat down. you will find it. I am only 5' 6" and about 175. managed to get it done no problem. wasnt patted down but im sure if i was i would have passed no problem. But did it matter. She asked me to fill it up to a line that wasnt even 2 ounces. I still filled it up most of the way. Hope this helps good luck!