make sure your doolie knows what s/he is allowed to have in their squadron. Sometimes there are rules about those things.
Here's what we did for years: Get the biggest FLAT RATE box from your post office and really STUFF IT FULL of whatever your cadet wants. Then buy candy, gum, pens, whatever, and use that as stuffing. Might I suggest chemical hand/foot warmers for fall delivery? STUFF THAT BOX. I think the weight limit is something like 70 pounds! Remember to take things out of their original boxes (cheezits come to mind here), since the foil/wax paper container takes up far less space. We stuffed tuna packets into our kids' boxes since they often missed dinner because of fencing practice.
STUFF THAT BABY TO THE BRIM!