It's not waterproof at all really. The fabrics are really high-quality with a DWR finish on them so they are highly water resistant, but in a downpour, you'll still want a raincover for the pack.

It depends on where you are--if you're in the Northwest this pack needs a raincover. If you're in the Rockies where you'll only get the occasional 15 min afternoon shower, this pack will be just fine without...