When I backpack and can pick my own campsites, I generally camp near water. I can refill my one liter water bottles right there. I understand that on the AT, I may not always have that option. On many of the gear lists for AT thru-hiker candidates, I see larger water containers for "camp water". Is there a benefit to carrying a larger water container all day so that I can fill it up at and carry it to a shelter or campsite?