DualShockers spotted the game on the Japanese PlayStation Store, where it's available to pre-order ahead of its September launch.
The PS4 version is more than double the size of its PS3 counterpart, which only weighs in at 11.7GB.
It's possible the European and North American versions could be slightly larger due to localisation, while Xbox file sizes remain unknown.
To celebrate the game's arrival on the PlayStation Store in Japan, Hideo Kojima shared a new poster of the game on Twitter.
Featuring a bloody Snake and Quiet, the poster says: "Stained in blood, the aftermath of revenge."
8月に展開予定の「MGSV TPP」最終ポスター。店頭展開は一部の店舗で。「GZ」の傷だらけのカズとスネークの喪失ビジュアル、昨年E3の顔を隠したオセロットとスネークの悪に堕ちるビジュアルに継ぐ、血に塗れたクワイエットとスネークの姿。 pic.twitter.com/tqLsIe01pw
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— 小島秀夫 (@Kojima_Hideo) July 23, 2015
Metal Gear Solid 5: The Phantom Pain will make its Xbox One, PS4, Xbox 360 and PS3 debut on September 1. A PC version will follow on September 15.
The game, which will be playable at gamescom, will launch with its very own limited edition PS4 console.
Inspired by Snake's bionic arm, the Metal Gear Solid 5-themed console comes in deep red with gold line detail.
Watch a trailer for Metal Gear Solid 5: The Phantom Pain below:
