First, share the page to Zholink. In the link details screen, click the download icon. It will download the page in the background.
On the main screen, click the "Downloaded Reading List" button at the bottom of the column "My Saved Links." You should see your link there.
This feature requires that you are logged in and an annual subscription of only (US) $12.99 / year.
Tips:
It's a good idea to turn on airplane mode to test what happens when you click the link. Some web pages (especially behind a pay wall) make it difficult to read offline.
It's also a good idea to visit that page (not in airplane mode) if you haven't in a while and before your trip. That way, it will show more of the cached images and display the page with better styling.