If you carry pepper spray or know someone who does, then you better test it. I usually would not admit to carrying something like this just because it draws laughter from people who think they are tougher than me, but I will make an exception today because I test fired the spay this morning and was shocked by the failure. I pressed the cap and a six-inch squirt came out and dripped all over my hands. The spay was never used and around one year old. Didn't Mad Max run around holding-up people and threatening them with his shot-gun, only to realize towards the end of the movie that both shells were duds? Anyway test your sprays or else if you should have to use it and it fails, you will need to settle for a good poke to the eyes with pepper drenched hands for defense. Would I be better off carrying a container of ground pepper seeds with a quick release lid? I know this sounds stupid (tactical seasoning), but very few people or animals can fight blind. This has to do with knives because good knives will never completely fail when they are needed.