I'm going to say that everyone has a small usb-thumb-drive-sized device that is used as a personal identifier/key and all-around informational gateway.  It projects an i-pad-sized holographic image that is touch-sensitive.  It basically acts like a smartphone.  It can be stolen, but it doesn't actually store any information, all information (especially personal information) is stored on the 'cloud' and accessed remotely.  It can be locked through various means including passwords, touch designs, biometrics etc.  I will call it the personal drive, or 'drive' for short.  This will make it convenient when I need to give your characters information, the map of the Incubator, for example.  it ill also give your characters access to things that have been assigned to them, lockers, rooms, cogs, etc., without needing to be given keys, or needing to worry about losing those keys or having them stolen, since you can always be assigned a blank and have all you information reaccessed.