In principle, of course, this is possible.
However, you have to bear in mind that children grow enormously during their primary school years - but their school bag does not.
When they move on to secondary school, most children therefore usually need a new school backpack that adapts to their new physical requirements.
At the same time, of course, their tastes often change and they need something "cooler" than the dinosaurs or unicorns that were popular in Year 1.