I'd say it depends on how damp your garage is. Generally cool and dry, keep a long time in the box. However, looking at your display address if you're looking to store awhile, assuming house climate controlled, just bring them inside. I had several BD+ filters made in 09, just kept them in the house, nothing more. Finished using the last one 5/17 and it was fine. BD+ did come in a nice plastic box, but I don't think that made a significant difference.