Decent size and fits well using roof rails but car roof got dented at several places even in 200 km drive on a smooth road with a few rumbler strips used at toll plaza on yhe way. Not recommended to use without a thick mattress underneath or on top of metallic luggage carrier. Three cabin baggage size suitcases and few backpacks fitted well. Denting of Creta roof has left bad experience of using this. Willbe cautious in using this next time. Does help in creating lot of free space in car.
Saves bags from dust and water. Key issue is that height (thickness) is low so you can't have suitcases "standing" - all the suitcases have to "lie down" (i.e the suitcase thickness is vertical) which restricts the number of suitcases you can carry on top. E.g, on my Tata HEXA, I can have 8+9 suitcases on rooftop luggage carrier normally, but with this bag, only 4 can be accommodated. If it's height could be more, it could have been a really great product.