is the fjallraven kanken laptop 17 big enough

Hi guys!

I've been eyeing the fjallraven kanken laptop 17 bag for a while now as I'm in need of a new bag for university. I currently have the jansport superbreak backpack and I'm struggling to pack most of my stuff which includes: lunch box, water bottle, 14 inch laptop, two chargers, an ipad, and occasionally 2-3 books.

However, when I was looking at the specifications of the backpacks, the jansport is 26L while the kanken is 20L. So I'm worried about the sizing of the kanken because why is it making it sound like the kanken bag is smaller than the backpack I have right now??

The kanken is also very expensive so I don't want to have any regrets if I end up purchasing it.

Thanks for reading!