(1) sarong for changing out of their swimmers,
(2) pillow if they are sleeping in tents
(3) bed throw over cots
(4) blanket on their journey
A towel is definitely useful. Is there space for one? These illustrations show the thought process that went into packing a towel for my Grade 2's trip to Malaysia. We had space in his carrier for his turkish towel as it was light weight and packed compactly. This super soft and quick dry towel fulfills all the functionalities outlined above and it completed our check list of items to pack. One happy camper off to his school trip with a well packed bag that was easy to tote. He even managed to squeeze in a pack of Uno cards!
P.S. When he returned from his trip, his towel was dry and did not have any sand residue on it. Luckily it looked used or I would have had to check if my son took any showers while he was away!