Well we have been caching for a little while now and have found a backpack is great to carry swag in along with some bug spray and bottled water for the hike. Also rechargable battery set is a good idea. some other things might include flashlight and a dental mirror on like a long handle, pencil sharpener have all been used on our journey. Enjoy the time it's great to see ya doing this with your son !! Also just thought a simple/basic first aid kit wouldn't be a bad idea either.