Yes, you can bring one of the yellow, pink, or clear plastic cups from a previous carnival cruise and use it. Keep it handy and keep refilling it. It takes up too much space. One hint, remember to pack in the carry-on when you board the ship cuz if you want a DOD and the cup is in your suitcase, well, you'll be buying another plastic cup.....
2007 Victory & Triumph
2008 Conquest & Liberty
2009 Valor, Freedom, and Splendor
2010 Glory and Liberty
We bring one of ours. I just went on a Jersey Girl reunion cruise and one of the girls took a glass with her. The bartenders all filled it and all of them said where did you get this glass? It was from a cruise she took in 1989. It was shaped different than the ones they give you now and it was glass not plastic. She had no trouble getting it filled with a drink either.
Yeah I remember those drinks that came in jelly jar type glasses. I really liked those. They were worth taking home. The plastic ones are crap and every cruise I see people leaving them behind. You can find a half dozen to take home with you just by looking around. Glass is too expensive I guess but it was worth the purchase price to me.
2008-Valor and Glory
2009-Spirit and Splendor
2010-Freedom of the Seas and Mariner of the Seas
2012-Allure of the Seas and Navigator of the Seas