Hiking backpack.   No school backpacks.  This pack needs to be big enough to carry your son's sleeping gear, 1/2 a tent, clothes, food and cooking gear.  If you are going to purchase one, 65 liter is a good starting size.  (Philmont packs are 75+ liters). We have a few backpacks to loan if need be.

Pack cover.   This is a rain proof cover that goes over the backpack in case it rains.

Sleeping gear.   Small pillow, sleeping bag, ground pad.

Mess kit.  Plate & fork at a minimum

2 or 3 - 1 liter water bottles.   (Philmont treks require 1.5 liter bottles)

Clothing - Keep this to a minimum.   Please do not send your son with a full change of clothes for one night.   Think in terms of "supplemental" clothing.

Full rain gear.  Pants and jacket.  No panchos.

Long pants.   Zip off legs are nice in case it gets warm.

3+ layers for top wear. Example: t-shirt, long sleeve t-shirt, fleece, rain coat.  Try to avoid packing a winter coat.  Layers are best and most versatile.  If it is really cold during the campout, pack an extra long sleeve t-shirt.

Extra pair of socks.  (Philmont requires wool socks.  These are extremely comfy and great for hiking)

Hiking boots or shoes.  If the weather is not going to be great, think about keeping you son's feet dry.   Try to avoid cloth tennis shoes.

Food - Sack lunch.  Food provided by the patrol.

Dry sacks or trash bags to keep all his items dry in his pack in case of rain.

Flash light or head lamp.