I'm planning to go on a full day hike, may be 2 days. Camping overnight is an option. The temperatures at night might fall below 10C. I really like your bag M McFeeli but I'm worried it might be a bit too small to carry food, water and clothing, how many liters is your bag? The closest I found was this waterproof bag http://militarytrained.com/product/military-multifunction-waterproof-backpack-bag/ But it doesn't say how many liters it is.