The term "portable" can refer to the ease of carrying or transporting something. In the context of "Benjamin Button vietsub portable," it's possible that you're looking for a version of the movie that can be easily downloaded or streamed on various devices, such as smartphones, tablets, or laptops.
"The Curious Case of Benjamin Button" is a 2008 American fantasy drama film directed by David Fincher. The movie is based on the 1922 short story of the same name by F. Scott Fitzgerald. The film stars Brad Pitt, Cate Blanchett, and Tilda Swinton. benjamin button vietsub portable
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Here's a report on "The Curious Case of Benjamin Button" with a focus on the Vietnamese subtitle (vietsub) and portable aspects: The term "portable" can refer to the ease