It's possible to check in at Sangster, when leaving Jamaica, using a kiosk. That means, if you don't have a bag to check, you can get your boarding pass and head right into security....the lines to check in if you have luggage are always really long with most airlines I've flown so for that reason alone, I never check a bag. Last trip 6 of us traveled together, only one of us had a bag to check and we all had to stand around for 45 minutes waiting for her before we could go meet up with Club MoBay and head in.

Plus it's just easier to have my stuff with me and be mobile since i tend to move around a lot. I bring travel size liquids, mosquito wipes, and buy more of whatever if necessary.