This is a great bag, definitely liquid proof. I spilled an entire coke on the top, everything stayed dry inside, and the outside cleaned up with no staining! My only gripe is the bag structure itself. Whether or not the laptop carry sleeve is inside, the bag does not keep its shape well unless you structure it with your hands. If it is full, it looks as advertised, but if you only have a laptop or a few things inside, it collapses a bit and looks rather flat. Either way, it looks great, and made with great materials, just wish it had a bit more of a frame!