Found black backpack with bright green straps containing books, a water bottle, and a small notebook near the riverwalk park in Wausau.

I found a black backpack with bright green straps at the park near the riverwalk in Wausau. It looks like it's been there for a while, and it has some books and a water bottle inside. There was also a small notebook that might have personal information in it. I'd love to return it to the owner, as it looks like something important was left behind.