Yurt is the word!

What makes the yurt self-sustaining?

Growing your own food on two acres with captured water makes your habitat self-sustaining.

Ah! And in his case the yurt is his habitat. Is it collapsible?

Yes!  There's a video at the link extolling his yurt's virtues.

"His yurt, which he says only really takes a week to assemble, came courtesy of the Pacific Yurt Company and uses a rainwater catching system to resource sustainable, fresh water."  

That's a wonderful video. Thank you for calling it out.