I bike commute to work which amounts to an hour's worth of backpack outdoor time most days. I've used it for a month now, mostly in nice weather but when it's been pouring rain it's kept my laptop completely dry in there. It's sturdy, waterproof and yet lightweight. I fit my bike lock in the slots at the back while biking. I love that it comes with a portable laptop sleeve. It has enough pockets to fit some extras that otherwise would rattle around in the backpack. If there is one disadvantage with this model it's that it has a zipper. As far as I understand it, this model variant (gas can) is the only one that doesn't have a folding top. I didn't think that this would annoy me but actually it's pretty difficult to open and close. I'm sure this is the tradeoff for getting a waterproof zipper. But I'd like to inform first time buyers like myself about it.