Instruct: Classify Amazon reviews into positive or negative sentiment
Query: good buy

This cargo bag was very roomy and extremely easy to use--just strap it to existing roof rack. It stayed very secure on our 900 mile vacation. The only negative comment is that the term "water resistant" should be used very loosely. We only experienced one brief rain shower that lasted only about fifteen minutes during our trip, and the items inside the bag were wet. Definitely worth the price if you don't experience rain.