Day packs are typically under 35 liters in capacity. The Day Pack category covers many possible options: messenger bags, book bags, camera bags, school bags, travel accessory bags and many more. Most day packs have been designed so they are multifunction, because the end uses are so varied. Interior details like key holders, organizers, bottle or hydration compatibility, dividers and wet zones should be checked out. Even though the loads carried in daypacks are less than Big Packs
, the design and comfort of the harness remains a key priority. And school text books get very heavy for young backs after 10 blocks.