Our young student women do not port packs on their backs. They hoist purses. Not book bags, clutches, or cute little handbags, but fully fledged madame cargo carriers. Everything fits: books, notes, phones, laptops, and who-knows-what. Sometimes smaller bags are employed as satellites. Pencil cases and microbags that emerge for special operations and then return to the mother ship. The use of purses rather than backpacks makes the transition from schoolgirl to lady seamless. When an adult woman backs a pack, she stands out as inalienably foreign.
The young men also do not use backpacks, but I not recall any particular class of accessory.