Trip Bundles combine all of your emails about a trip, such as flight times and hotel reservation numbers, enabling you to view them instantly after opening Inbox. Google's screenshots below, for example, show a Trip Bundle for London that displays information for a flight from Austin to London, Hertz car rental from the airport and a weeklong hotel reservation at The Blue Hotel.
The latest version of Inbox improves upon many core features of the app, with new Undo Send functionality on mobile for retracting an email right after sending it in case you made a spelling mistake, contacted the wrong person or have second thoughts. Also new is the option to make "Delete" the default swiping action, custom signatures, suggested reminders and the ability to view HotelTonight or Eat24 reservations and food orders directly within Inbox.
Inbox by Gmail is free on the App Store for iPhone and iPad. [Direct Link]