Christmas Gift Ideas for DS In Navy

[MrsTwankey]

DS1 is in the Royal Navy and this will be the first Christmas he won't be at home as he's now away on a ship.
Want to send him a Christmas box full of treats/goodies - can you lovely mumsnetters come up with some ideas?
He's nearly 21, living quarters on the ship are cramped and I don't think he has much personal space for hanging posters, calendars etc.