I had some white russian seeds that lasted longer than 2 years in a little vile with a cap that I got from everyonedoesit.com before they stopped shipping to Pennsylvania.
MAybe even store them in a glass jar in some sorta bag that is close to air tight???????????????
If you have your own high quality seeds. you wanna save them for as long as you can. Plus you can make your own seeds, and that'll save you some serious cash money.