If you bought transfers through Carnival you will need to print out that page of your e-docs. You need to print off your luggage tags.
Heck I'm the kind of guy that prints off all my documents.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014