You can share lists and items. To share lists, touch the share button on a list screen. To share items, touch the share button on an item screen.

You can share data for lists and items by email and AirDrop. By sending data to yourself by email or saving data to files, you can use them as backup.

Please see the following page to know how to use AirDrop.
http://support.apple.com/kb/ht5887