From nursery to high school, the school bag changes in size and purpose: a small snack bag, a rigid A4 backpack, then a rucksack capable of fitting textbooks and a laptop.
The right school bag isn't the same at three years old as it is at sixteen. The volume doubles, the size of books changes, and back support becomes an issue as soon as the load exceeds a few kilos. Each stage requires a different approach.
In preschool, a small bag of five to ten litres is enough: it holds a snack, a change of clothes, and a comforter. The child should be able to open and close it independently, which eliminates hard fasteners and complex buckles. The empty weight is more important than the volume.
From primary school onwards, the rigid A4 size becomes the standard. At this level, school bags must accommodate this size without bending the corners, featuring padded straps and a chest strap to prevent the bag from tipping. This is also when wheeled models become practical for longer journeys.
In secondary school and college, the school backpack increases to twenty or thirty litres and needs to fit textbooks, binders and often a laptop. Look for a padded compartment, a ventilated back and a zipper that opens wide. The school bags at this level wear out at the stitching where the straps are attached: that's where you should check for reinforcements.