Review on Stay Safe And Dry With HiVisible Reflective Rainproof Backpack Cover - Perfect For 10-30L Backpacks! by Tim York

It works well under mild rain, but for heavy rain not so much. The video is not completely accurate, I believe, it does leak. I covered my leather backpack today and walked under the rain, and it leaked and now the leather is messed up. I trusted the video, but I shouldn't have. That said, the sellers are responsive and have a nice customer service. As I said it is a good product, but heavy rain is tricky. You may want to put two layers on top of each other