I’ve attached two different check lists for packing luggage to St. Kitts. Be mindful, first of all, of any embargoes which would prevent you from bringing more than 2 bags per person into the country. You can find out by calling the airline you’ll be using to travel to SKB.
First is the list of the things I had in each of my bags and what I found useful to have, not useful to have, and things I’d recommend if you have space: Packed Bags – UPDATED
Second is a list of the check list that an upper suggested, yellow is what I packed: Suggested Items to Pack
Hope these help!