I try to keep the contents of my mini survival kit in mint condition as well. I check often to make sure all is well but I want the stuff to be in the best shape possible for when I need it in and emergency.

Other than emergency items I try not to carry anything that I don't have a need or use for. I think back up items are good(like matches) and a small back up blade is nice to name a few, but I am carful of overkill.