A Wallet

1. A small case, often flat and often made of leather, for keeping money (especially paper money), credit cards, etc.
2. (by extension, informal) A person's bank account or assets.
3. A thick case or folder with plastic sleeves in which compact discs may be stored.
4. (archaic) A bag or pouch.
5. (slang) A person's buttocks (the area of the body nearest where one keeps one's wallet).

billfold

pocketbook