The Keyport Slide 2.0 already reduces the size of your keychain, but adding these Bolt locks will further reduce the number of keys you need to carry. Each Bolt lock can be keyed to your car’s key, so you can unlock all your Bolt locks with that single key. You program the lock by inserting your car’s key and turning it; the Bolt lock “learns” the key automatically. Keyport offers three types of Bolt locks: Receiver Lock (left, $34.99), Padlock (center, $27.49), and Cable Lock (left, $39.99). Bolt works with “over 110 million vehicles”. Look for more information about Bolt locks at Keyport.