What reader app can fully download articles for offline reading?

Is there any decent reader app for iPad and/or iPhone that will fully download articles so that I can read them offline

I have tried many like Feedly, Pulse (which became a much worse app after Linkedin bought them out), and others I can't remember the name of.

Some blogs will have the articles fully downloaded but some just have an excerpt. If I am not mistaken this is because some blogs put the full article content in their RSS feed and some don't. So if that's correct I guess what I am looking for is some reader that will download articles via some other means than RSS.

Basically I want to be able to download a massive amount of reading material from my favorite sites for long flgihts.

Thanks.