Fit the child as well as the school items
Check exterior dimensions and strap adjustment against the intended wearer, alongside the size of any folder or lunch container that must fit. Eighteen liters is only a volume measure. A bag can contain the required items while still being an unsuitable physical size for a particular child, so both checks matter.
Look at practical access
Consider whether the child can operate the offered model's closures and find everyday items without unpacking everything. The title does not specify the pocket arrangement, so inspect it directly. Device storage also needs verification if required by school, and any carrying guidance should come from the current manufacturer information for this exact children's model.
