Packaging a bundle means to compose a system with System Runtime core systems. By doing that System Runtime library will include your system (i.e. your code will be include in system-runtime.min.js file).
To do so, put your bundle in the addons directory of System Runtime. Then build System Runtime and the bundle will be composed with System Runtime core systems.
When System Runtime will run, your system will be ready to be started.
Remember that the example works only client-side.