Source: https://www.konami.com/mg/mc/eu/it/
>Important Information Regarding the Game (Nintendo Switch™ Version)
>To enjoy all available content, game data must be downloaded (free).
>* Internet connection required
>* 31.4GB ( + 30 GB for bonus videos )
>A microSD card (sold separately) with free storage space of minimum of the amount listed above is required to download this game.
>*The total game size and necessary storage requirements listed above are still tentative and will be finalized by September 2023.
>*The bonus video content is referring to Metal Gear Solid: Digital Graphic Novel and Metal Gear Solid 2: Digital Graphic Novel.