So I was sitting here thinking about something and I'm sure someone has already thought of this already and possibly even made a thread about it but I figured I'd see if I could get some information from some of the experts here on the forums about this idea. So lets say that you have decided to take a tolerance break for a while or just were stopping in order to get clean for a pre-employment drug test. If you are comfortable with substitution, why not just start to save a bunch of your clean urine for a rainy day basically? Start to collect samples of it once you know that you are 100% clean, put it into an air-tight container, and freeze it. From what I read on the Substitution thread, real human urine can stay good for up to a year if stored properly. Heck, you could make a pretty lucrative little business even out of saving a bunch of your clean urine from when you decided to take a tolerance break or to prepare for a employment UA. Than selling it to people later on. Like I said, I'm sure there are other people who have thought of this already but it seems like it'd be a great idea. As far as storing it goes, what type of container is best for freezing your urine in? Would some of the Zip-Lock freezer bags be good for this? What do you all think?