It is not waterproof as I would like, because the zipper leaks water (except for the convenient/quick pocket on top), so if this bag gets knocked over, it will leak water (e.g. if you put ice cubes that turn into water within 4-8 hours, depending).

However, this bag is ideal mostly for ice packs. Well, it's good for €14.

UPDATE: Do not put anything glass inside because if it breaks due to shaking, both insulations will likely tear and it will leak water. This happened to me. But it's still okay if you use ice packs or frozen water bottles instead of ice cubes.

Also, I have to mention that the interior gets dirty over time, being white and not cleaning well, it has black marks. You can put it in the washing machine.