Backpacks are commonly used by students,traveler,hikers,running, cycling for carrying heavy loads or carrying any sort of equipment.
Daypacks: For hikers and campers on shorter trails and trips.Generally soft-backed or frameless
Sport backpacks: Designed for specific sports.Have compartments for equipment, footwear and water bottle.
School backpacks:Designed to carry books,notebooks, pens,laptop,tablet and more
Hydration packs: Designed to provide water while you're on the move