Evernote is a surprisingly good alternative. I switched to it from Instapaper (which I really liked) because I could save article along with notes, file them with other notes and stuff, etc. With Instapaper I felt like I was saving things that I'd read in one silo (my RSS reader) into another. For how I work, web articles are just one set of things I want to sort together (actually I mostly use tags instead of notebooks)

Unfortunately the "read at altitude" is a paid feature, at least for tablets and phones (maybe windows/mac too, I don't know). So that might make it not work for you.