Been daily driving this for about 3 years now and I've got only good things to say about the Bellroy Classic Backpack. It's got a minimalist design and looks very sleek, super comfortable straps, durable materials, YKK zippers, the list goes on.
My only gripe would be the leather tabs for the zips, but that's personal preference and can be easily remedied with some paracord ties or key chains.