Although the YouTube mobile apps have been providing offline viewing capabilities for more than two years, the availability of this feature that can come quite handy in certain situations was limited to a list of select markets. That list was not long at all, but now 109 new items have been added to it, bringing the total of markets with YouTube offline viewing support to no less than 125.
https://www.notebookcheck.net/YouTube-offline-viewing-reaches-109-new-markets.287222.0.html