In various examples, a fiber-optic-splice enclosure may be suitable for use in various applications, environments, and use conditions. In at least some embodiments, the fiber-optic-splice enclosure includes an adjustable length, which may permit the fiber-optic-splice enclosure to be customized to fit various lengths of a spliced region. In a further aspect, the fiber-optic-splice enclosure may include a splice retainer to attenuate vibrational and other forces and reduce potential effects of those forces on the splice. Moreover, in some other aspects, the construction of the fiber-optic-splice enclosure may allow for relatively straightforward and efficient assembly. For example, a key and keyway configuration between different components of the fiber-optic-splice enclosure may permit the components to selectively slide relative to one another or be engaged to one another.