Some parents ship their children out with enough stuff to equip Patton's 3rd Field Army. Other kids are lucky to leave home with a toothbrush and a change of underwear. Call ahead for a list of recommended items.
Every camp has different requirements.
No matter what they say, always pack an extra pillow case. Mark or label everything with your child's name. Include a list of emergency phone numbers and email addresses. If your child takes any medication, include the phone number of the physician in the event the prescription is lost and needs to be refilled by camp staff. Pack a disposable camera.