As teenage boys are rarely organized (or prone to keeping to original organization if you're there to help settle them in), I put all the 'bitty' things into the shoebox sized plastic boxes to be stacked in his closet, and labeled them. This also helps with storage as closet/drawer/shelf space is very limited.
-Desk Supplies
-First Aid
-Repair (sewing kit, scissors, glues, etc)
-Garage (everything he would have gone to the garage for at home: tools, spare ext. cords, etc)
Shelving is important, whatever the housing, so bringing a unit or stacking cubes is always a good idea.
If his accommodation does include a living room and/or a kitchen, ask coach/the school for the name and contact on roommates(s) to divide up the communal stuff. Not only do you not need two or more sets of pots, dishes, etc, but there won't be room to store them.
Many schools ban George Foreman grills because the students don't clean out the grease, and they become fire hazards.
Find out as much as you can about the accommodation, if you haven't been able to see it in advance. It's very easy to send too much off with him, so always think: does he NEED this, and will he take care of it?
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From 'Nice Guys Finish Last' by Leo Durocher:
Baseball lives at the center of a never-flagging whirl of irreconcilable opinions.