WEBAmazon.com: Big Keychain. 1-48 of over 100,000 results for "big keychain" Results. Price and other details may vary based on product size and color. Overall Pick. Lucky Line - Unisex Restroom Pass Key Tag, Plastic with Split Key Ring Keychain Identifier for Restaurant, Office, Gas Station, 1 Per Pack (53201) 749. 200+ bought in past month. $499.