Lots of feedback around here on that kind of stuff. You could keep it in a dresser drawer for two to three years and probably wouldn't have any noticeable degradation.
I've read on numerous boards that if you vacuum seal it or double up on some freezer bags and freeze it the product will last as long as ten years.
Your enemies for shelflife will be light, heat, and moisture. Keep your stuff away from those three and you'll be set.