urban performance. the daypack proof backpack by aevor comes in a functional urban performance look. the waterproof fabric is perfect for your morning bike rides to the office. your laptop stays dry even when the sun didn't show up and rain is your buddy for the day. the backpack features everything you need. furthermore, you can unfold the daypack from 18 to 28 litres.that feature is very helpful when you decide to head to the supermarket after work.