Aha! I have never had any of those. Since I really don't store roasted coffee at all I have never needed anything like that. I have never seen any reason to use valved bags anyway. I put my freshly roasted beans in normal "Ziplock" bags shortly after roasting, roll the bag up to remove excess air, zip them and let them sit in a dark cabinet for a 2-3 days, whereby the bags develop a bit of CO2, which doesn't bother me in the least. From there I dump the beans into the grinder and use them within the next week. Of course, this doesn't help our friend Rujir at all.
Over the last 15 years I have tried all kinds of storage methods including vacuum, pressure, freezing, cooling and so on. As I mentioned above, the only factors I have found that change the process are negative ones that make aging quicker, ie. heat and light. I didn't want to roast my own, but I was (and still am) convinced that coffee is not a storage commodity and if I can't drink it fresh (<14 days after roasting) I don't need to drink it at all. I am, however, in the fortunate situation of having a couple of good roasters and sources of green beans, I enjoy roasting and enjoy my own roasts. For that I'm quite thankful.
