collapsible

Short definition from Wiktionary

Adjective

1. 1
   Designed to be collapsed, especially so as to be more compact when not in use.

Noun

1. 1
   Any object that can be collapsed to save space.
2. 2
   Any object that can be collapsed to save space: A kind of boat that can be collapsed for greater portability.
3. 3
   Any object that can be collapsed to save space: A display element that can be collapsed to hide it from view.