20 Lbs into a 10lb bag
If you have a wife, three kids, and never enough room in the car when you are packing for a vacation, then this bag is your answer. The bag itself is well made. The seems didn't appear to stretch at all.

it's okay...
If you are thinking about buying this item, take a look at the picture first. Because it is what you are going to get beside the perfect shape.
The description says the foam holds it's shape for aerodynamics. Yes, I guess if you packed it like that. Just make sure you trash bag your stuff incase it rains...The bag it not waterproof. But over all, short or long trips if you want a cheap cargo carrier this one is pretty good.

Great space saver
We bought the Tahoe from Thule because the three teenagers we tote to vacation take up a lot more space. We were able to fit all our luggage for a two-week vacation in the roomy cargo bag. We drove through very hard rain for much of the 500-mile trip, yet our luggage was barely damp. The side hand-holds make it easy to use and the storage bag makes it easy to store. This one costs more, but it's worth it.

Do NOT BUY!!!
This bag is so not worth the money. If you are looking to get a car top carrier get one that is plastic. This product is also not water resistant like it states. I will never buy a product from this company again!!!

Works as Advertised
We bought the Thule Tahoe Rooftop Cargo Bag for a roadtrip from Texas to Florida.

1. The bag was easy to use, and the instructions were good. It attached right onto our roof rack with no probolem. I had read other reviews and knew to have safety pins (8 to be exact) to secure the excess strapping to the bag, or it will make noise while you're driving.

2. It rained on us part of the way down, but our luggage was inside plastic bags. The plastic bags did get wet, but our luggage was fine. I would say that the bag is weather resistant as claimed becasue there wasn't much water in the bag after the storm.

3. The bag produced drag, and it affected our gas mileage and gas was over $4.00 / gallon at the time.

4. Removing and putting on the bag at each of our stops wasn't a big deal. We only had 2 suit cases, and a toiletry bag in there - so it was a snap to get them out/in, and then the bag off/on.

The bottom line is that if you need extra space in your vehicle, don't have or want to spend the money on a hard top cargo carrier, and probably if you're not driving 1600 miles roun-trip (my opinion that this better for shorter trips) - then this bag is right for you.