I use the peg holders I have 2 for regular thread and 1 my DH made me for serger thread. I haven't had any problems, but mine is hangs in a cabinet with the doors closed most of the time. The over stock is kept in plastic containers. I also keep my thread for the embroidery and quilting machines in plastic, they are the only ones that I have ever had trouble with related to lint. As far as, thread over 3 yrs old I've used some and have never had any issues. As far as the storing, I probably would not store mine out in the open, but I think it is a personal choice. I've heard good and bad on both.