Sis, as long as they can fit thru the scanner, I don't know if their is a limit. Just piggy back them to each other and off you go. But remember if you check in too early you might not be able to go directly to your cabin and drop them off before lunch.
Teresa and Larry
#36-Carnival Splendor 9/16/12
7 night Mexican Riviera
#37-Allure of the Seas 11/11/12
7 night Eastern Caribbean