On this page of the FUT 22 mode guide in FIFA 22, you will learn how to preview the contents of the pack.
FIFA 21 added the option to preview the contents of a pack before purchasing it. This feature appealed to all fans of the series, so EA decided that it will also be implemented in the latest installment, FIFA 22.
After logging into FIFA 22 Ultimate Team, go to the Store and select the package with the distinctive eye icon in the upper right corner - the pack is marked in the image above. Then, instead of buying the pack outright, select the Preview Pack option to check what's inside. If you like the pack's contents you can buy it - in return you'll be able to preview the next pack, etc.
The pack preview feature in FIFA 22 is available once every 24 hours and is definitely worth using.