Thank you for your input i can honestly say that it is the first thing i have heard that really put me at ease about using the QF 4. I just have a couple more questions if you can find the time. I worry that i Might be checked at lab corp and asked to empty my pockets flip them inside out and or be frisked. Is the hard plastic bottle a good carrying case or should i replace it with something more flexible.. ( I am planning on crotching the bottle, bag whatever.) If any one has experience and knows the best way i would appreciate your input. thanks again