If you like your backpacks simple, functional, and clean-looking, this Karactermania Fan HS model is a great pick. It's a lightweight, grey urban backpack with a single main compartment – no fussy organization, just a big space to throw your stuff in. There's a handy front zipper pocket for quick-grab items like your phone or keys.
The shoulder straps are padded and adjustable for comfort. A cool feature is the rear trolley strap, so you can slide it over your suitcase handle when you're traveling. Dimensions are about 41 x 30 x 18 cm (roughly 16 x 12 x 7 inches), so it's a good size for a 15-inch laptop, a notebook, and your daily essentials.
It's not loaded with features, but sometimes that's exactly what you want: a reliable, no-nonsense bag for school, work, or short trips. The grey color goes with everything. Simple, effective, and gets the job done.