The file size for the digital version of Fallout 4 has been leaked through Microsoft's listing of the game, and I must say, you will be pleasantly surprised to hear the numbers, especially if you're currently low on hard drive space.
There's no denying that Fallout 4 will be one of the most, if not the most expansive games released this year and as a result players are already expecting a large download size. Surprisingly though, Bethesda has done a great job at keeping the file size at a minimum.
If you choose to purchase Fallout 4 digitally on the Xbox One, you'll be looking at downloading and installing 28.12GB worth of space onto your console. The PlayStation 4 numbers haven't been revealed but they are likely to be very similar to the Xbox One's number.
At 28.12GB, you shouldn't have to worry at all about installing Fallout 4 onto your hard drive. It's also important to remember that you won't have to use any storage space for the base game if you purchase the physical copy of Fallout 4. Players will need to install additional patches, have space for save files and be prepared to install digital DLC in the future but this shouldn't take up anything near the full 28GB install size.
Although this news is quite surprising, Bethesda has always managed to keep the file size of their games to a minimum. Fallout 4 will apparently have twice as many assets as Skyrim, which took up a total of 6GB on it's launch date.