I do the same thing, I never pay exact amounts and I usually have 2-3 dollars a day average in loose change that I put in a 3 gallon water jug, its almost full and its time to start another. I read somewhere that someone was saying its illegal to hoard cash like this because its not traceable or taxable.
I can almost promise you that if he was pulled over and cops found all the money in his truck, he would never see it again. It appears now that if you have lots of ‘cash’ then its a bad thing.
Anyway, I always put anything less than a five into my ‘coin’ jug and it adds up quick. At the end of the day, all the ones, and any coins go there.