BUILT-IN PROTECTIVE MAT - UPGRADED Pearl cotton mat is built into the base of the car top carrier to prevent the contents of the bag from scratching your expensive roof paint. FIXED NON-SLIP MATS - UPGRADED 3 Non-slip bottom prevents the roof carrier from moving while driving. Without the hassle of lining up the roof bag with external mats again and again! 20 CUBIC FEET - 48"L x 36"W x 20"H, The large car rooftop bag will save you more space for your travels. Allow folding when not in use, and pack it into the high quality Oxford storage bag. 100% WATERPROOF - Heavy duty PVC with waterproof double coated surface + 3” wide zipper cover completely hides the zipper + Waterproof coated zipper will shield your belongings from heavy rain or snow. FITS ANY VEHICLE - KING BIRD uses 6 door hooks and 10 noiseless straps to make it work safely in any vehicle with or without a roof rack. We offer 2 year warranty and replacement of all parts, If you are not 100% happy with your purchase, let us know so we can help you solve the problem.