Last year, my friend brought some stainless steel ones in the beginning of the switchover, and a security checker at the front of the part questioned them and almost made her throw them out....so yeah......we went with whatever ones they had in the park after that....
But here's my problem with these paper straws.....when everybody was getting all "paper straw crazy" last year, all the paper straws they were using (when I was on vacation in Chicago) was AWFUL....I kept saying "Animal Kingdom has had paper straws for over 10 years! They don't fall apart! Don't give us straws that disintegrate after 10 minutes!"
UGH