I plan to use this at school where there is a lot of work and books to carry. Let's see how it holds up. The material is good, but supposedly water-repellent. It was misleading but the contents inside don't get wet. There are 2 layers in the top valve/lid, so the outer one absorbs water, but the inner prevents it from penetrating. The biggest problem is that the water bottle pockets are incredibly small. The non-USB side barely fits the *fake* water bottle, which is thinner than most regular water bottles. The USB port side doesn't fit in a bottle, but it's great for holding a phone. However, I don't recommend putting your phone there depending on how many pickpockets are around you. Edit: The quality is pretty bad and after a few months of use, threads are snapping all over the place. The laptop bag doesn't protect either - my laptop bag ripped at the corners (and I don't drop my backpack on the floor and such). It would be better for light, occasional use - if you plan on using it all the time I would recommend to pay for a more expensive one. and a better backpack. The best backpacks only cost 2-3 times more and last 5 (or more) times longer.
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