Rooftop Waterproof Cargo Carrier

This is my very first purchase of a cargo bag or any kind or cargo roof carrier. I've looked at cargo boxes vs cargo bags. I went with the bag due to the ease of set up, removal and stow away. I ordered the 16 Cubit Feet for our 2018 ford explorer. it was exactly what we needed. The product itself was great. It is exactly what they advertise. I was very happy with it. It is strong and definitely waterproof. Great quality materials and easy to fold after use. We drove over 1,000 miles this summer and the bag performed excellent. We drove in light and very very heavy rain and wind. And the bag protected our items. No rips, no noise on the road. Even driving over 75 MPH.... But I did notice a slight dip in our MPG as mentioned in other reviews of bags and cargo boxes. So that's nothing out of the ordinary. Although you don't need a roof rack but having a cross bar was very helpful. One issue with 16 cubit or a larger bag is that it has to sit on top of the rear cross bar. But it did very well. And I love the fact that you can remove and fold the bag away when we reach our destinations. But here are things I've learned in general for this product or any other carrier bags. First, I had an item that was slightly taller. Although it fit in the bag with other items, but due to the low clearance of our garage, I had to load that item in the bag outside of the garage... And yes, you've guessed it.... In the rain.... Second, getting up and down with opening and closing the bag was getting tiring. We had a long road trip needing overnights in hotel to get to our destinations the next day. To avoid going up and down all the time, we packed a few clothes in one separate bag and keep inside the car with us for the overnight stay to avoid going up and down to unzip and zip the bag. Especially when it rains. That's the only time your items will get wet. Third, Not sure why, but they did not include tie down hooks. Although it doesn't matter if you have a roof rack. But if you don't, those tie down hooks definitely helps. I bought an extra strap with those tie down hooks for extra protection. As for a carrier bag, I think this is the best one out of all the others that I've searched. After our long trip under the natural elements, I have to admit that the bag performed very well.