Security packages to store your private documents. It is made of high-quality plastic, which is resistant to mechanical and thermal influences.
Have you thought about how you store your mnemonic phrase? What if someone finds it and uses it? Backing up your cryptocurrency wallet is very important, but anyone who gets access to it can take over all the coins in your wallet.
This may not even necessarily happen immediately, you can use your funds and only after a few months find out that it was compromised and the funds were stolen
These tamper-evident bags keep your passphrase safe. If someone will try to open the package, it will be irrevocably corrupted. It will help you to determine the attempt to access your phrase.