I bought this roof bag the night we were going out of town. We drove 18 hours and experienced heavy rain. The bag stayed in place with the straps provided even though the straps feel a little stiff, they were still strong and flexible. Everything was dry upon arrival. On our drive back everything inside was damp from heavy rain but I think the flap that covers the zipper was flipped up. It should be ok as long as you don’t overstuff the bag and you’re careful about covering the zipper all the way around, you’ll be fine. If you have an option to get 20+cu, get the larger one. Everyone said these were huge and while our stuff fit, I could’ve used a roomier bag to eliminate extra inside cargo. This is for a one week trip for two adults and four children.
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