Expandable (adjective)

1. Capable of being extended or increased in size or volume.
2. Able to be made larger or wider.

Origin:

From middle english, from latin expandere ("to spread out, extend"), from ex- ("out") + pandere ("to stretch").

Examples:

1. This tent is expandable, it can be made larger by adding additional sections.
2. This storage container is expandable, you can add more storage space by purchasing additional units.
3. The expandable briefcase can hold more items when needed.
4. The company's product line is expandable, they are constantly adding new products to their catalog.
5. This room is expandable, it can be made larger by removing the partition wall.