What does your 11-12 year old carry their phone and tissues etc but don't need to take a backpack? Something like this [[https://www.fjallraven.com/uk/en-gb/bags-gear/backpacks-bags/travel-bags/high-coast-pocket?v=F23226%3a%3a7323450938079 Fjallraven]] phone bag? What if they are going somewhere they need to be smart?