Replying to Any suggestions on backpacks?

I've had the same backpack for probably around 6 years, it a pretty nice North Face but it doesn't hold that much and doesn't have any straps for a skateboard. I'm mostly looking for a backpack that can hold a lot of shit including a computer so it would have to be waterproof and padded and just something that i could switch between using for school and travel and skate/ski stuff. ill only be using it for school for like 2 more years any suggestions would be greatly appreciated I'm looking to spend up to like 85ish.