redgentleman, welcome to the forum. Keeping your tobacco at it's optimum humidity is a forever changing proposition. Sometimes when you open a tin it is perfect, sometimes is is soaked, on rare occasions too dry, same with bulks. Once you find the right humidity for you, then you need to figure out what storage methods are suitable to you. I have my ways and people have theirs. I would always prefer my tobacco to be too moist, this way I can always dry it out before smoking. Of course I love opening a tin that is perfect and have a storage method to keep it perfect, but for me, nothing is worse than tobacco that gets too dry and then it has to be re humidified. I believe it loses flavor and it is a rare instance when that happens to me, when it does then the subject of re humidification comes up and people have different methods for that. Here is a picture of my storage methods. On the first shelf are plastic jars that I store bulks in, I prefer these because they have silicone gaskets which do not deteriorate after 10 plus years. On the bottom shelf are plastic containers that I keep my open tins in, they will keep tins fresh like that for a couple of months or more. All of my storage jars and containers I buy at Walmart. Many people use mason jars for bulks and those work great as well. I prefer to age bulks in two pound containers just because of space issues. If you have an open tin, I would not suggest just leaving it out, it will dry out fairly quickly depending on your environment.