Whether for school or work, you can always find a good use for a backpack. The material of choice for this bag is polyurethane and it has a 28-litre volume.
From Wardow
Vaude Wizard 24+4 Backpack blue
Trekkinn
Vaude Tents Wizard 24+4l Backpack Blue
This product is also available at 1 unverified merchant.