I found these in one of my diseased relatives' gun rooms. Stored in a cool/dry area, never opened, all full. Gauging by the looks of these, some of these gun powders are over 30 years old. I haven't opened any of them yet and I do plan to have a look but when I do, if the powder turns out to be good still, I plan to use it right after I open it. I figure if I got this lucky, no sense on pushing that luck.