The term 'Canteen Carrier' can be summarized as a HIKER, which is someone who goes on long walks or hikes in nature. Hikers often carry supplies such as food and water, and the term 'Canteen Carrier' refers to someone who carries a canteen, which is a container used to store liquids. This person is responsible for carrying the canteen and ensuring that it is filled with enough water for the duration of the hike.