I have a whole collection of backpacks, ranging from a massive 5.11 Rush 72, down to a tiny IKEA FÖRENKLA. The latter is my daily driver and has been for almost two years. It's a tiny 12L backpack that fits everything you need for the commute to work or for a short trip. It just nails the basics in a way that my other backpacks haven't been able to match and despite my best efforts to find a replacement for it, I just haven't found anything that is as practical.

Is it waterproof? No but I've used it almost everyday for the last two years, through rain and snow, and everything was nice and dry upon arrival.

Will it protect your laptop from a fall? Maybe. Haven't really tried :)

Does it cost less than €20 / $23? Heck yeah it does!