This is what I do for Jed when we are packing for a trip. I make him a packing list. He always wanted to pack his own bag, even when teeny. Ever since the time when we arrived somewhere and I discovered his bag had been carefully unpacked and re-packed with ten pairs of pyjama's, a wooden sword and a pack of his toy animals.
The packing lists are empowering and also do double duty as one of those sneaky learning experiences I am so fond of. Also, just selfishly, I don't want to be packing his bag when he is sixteen, so I figure we start young!