The original purpose of the cigarette case was to protect those fragile cigarettes from being crushed when carried in a pocket. They very quickly, however, evolved from utilitarian accessories to elaborate fashion pieces. Most cigarette cases are flat boxes that open up like a book. Some are large boxes meant for home use not unlike a cigar humidor; most cigarette cases are portable and many of those have a flair for design and personalization.
You can learn much more and check out some beautiful antique examples of cigarette cases at this awesome blog called Collectors Weekly. See the article here: http://www.collectorsweekly.com/tobacciana/cigarette-cases
The Smart Armor Safe would make a fine modern cigarette case, or just a great protector of all small items you need to carry with you.