There are 5 types of packages. The popular characters "Levi", "Ellen", "Mikasa", "Armin", and "Hanji" are drawn respectively. By scanning the QR code on the back and accessing the web page, you can download the illustrations of each package as wallpaper for smartphones, and you can play the original voice of each character, "Healing Words".
Also, if you have all 5 types, you can download an illustration of 5 people as a wallpaper for your smartphone, and you can listen to the original voice drama "Survey Corps Relaxation Time" by Tea Kaden.