Mine seemed to stay mostly dry all day, but it was cold. When I unloaded at home and opened the bag it had standing water in the bottom and everything except the dry bag was wet, the lid compartments were less wet than the bottom. Might be the lower seam letting water in. Putting on silicone spray to see if that helps. Considering it's a hassle to mount these, I'm starting to wonder if they're a complete waste of money and time. They could easily use the waterproof fabric for the entire bag rather than half waterproof and half canvas. And although I love sled solutions bags, I can't spend that much on one.