Don’t take your national identity card in the wallet. It will be huge problem If it missed.
Do not pick up your al the debit and credit cards as if you lost all the things you have to call all the banks to cancel those. So use some important card for urgent things.
If your wallet missed you have pay your attention for your locks and keys in the home. Don’t put spare keys to wallet.
Don’t put some photos which you cannot get again in your life time.
Don’t put your bank card passwords together with cards in your wallet.
If you have to write a check take one page only. But don’t put your checkbook to your wallet.
Take some enough money. But don’t carry on tones of cash. Money never can be found if you lose once.
Don’t put your passport to your wallet. That will give permission to thief to do things by our name.
Don’t put receipt that include your bank account numbers. That will give a chance to thief to drain your account.
Don’t put lucky token to your wallet. If you lose your wallet then you will lose your lucky token too.
Many people love to keep phone in wallet as they very slim. But don’t do that. If the wallet lose you have to say good bye to your phone too.