The Mass Effect series was a major franchise during the last generation of gaming and many wondered if we would be able to play them on current generation consoles. While EA has been public about not being sure about remasters, Xbox One owners can play the entire series on through the Xbox 360 Backwards Compatibility program. Mass Effect 1 was one of the first 360 BC titles on Xbox One but now Mass Effect 2 & 3 are on the Xbox One storefront as 360 BC titles.
Mass Effect 2 and Mass Effect 3 are now both able to be played on Xbox One. Since the games were multidisc, there is no digital option on Xbox One. According to Reddit, Mass Effect 2 is 13.2GB and Mass Effect 3 is 15.6GB.