Abstract: Various improvements for portable containers such as luggage. Various systems, devices and methods are provided for increasing functionality for luggage and other portable containers, for example for personal travel. These improvements include a power box for portable energy provision while traveling, that may optionally be integrated with a suitcase; a portable document handler for convenient and secure transportation of documents; and an elastic strap designed to better secure luggage, as well as optionally providing a visual identifier for a bag. These improvements may optionally be used together or separately.

Abstract: A small pet habitat system includes a plurality of modular habitat units. Each of the habitat units includes a rigid housing defining a chamber, at least one integral coupling feature, and a functional component. The habitat units are configured to be modularly stacked to form a multi-unit pet habitat structure in which the coupling features of adjacent ones of the habitat units interlock to limit relative movement between said adjacent habitat units. At least two of the habitat units have different functional components from one another.