Probably have to resign yourself to schlepping your luggage around. There is no actual baggage check in at STT. You get a luggage tag at checkin and carry it through C&I before giving it to be x-rayed. I do not believe there is any on airport storage spot either.
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. - Mark Twain