I love talking and packing my kids for camp.  I am all about lists, piles, labels and more.  I strongly suggest that you pack with your child so they can help take ownership in their own organization and packing experience.  They are going to be in their own cabins trying to figure out how to get dressed, shower, make their own beds, etc.  The more involved they can be in the packing, and knowing what's in their duffels, the better off they will be while they are at camp.