Quick Answer: The best daypack depends on the load and trip. Choose roughly 10–18 liters for essentials and short walks, 18–25 liters for hiking or sightseeing with layers and water, and 25–30 liters when carrying a laptop, camera gear or a longer day’s supplies. Packable daypacks prioritize low stored weight; structured hiking daypacks prioritize ventilation, stability and comfort. A daypack is smaller than an...