【Most Safe Design】: For security reasons, we use 8 reinforced adjustable straps to keep the cargo carrier in place. In addition, equipped with free anti-slip mat to keep the cargo bag stay in place even in high speed road or bump road, no slip, no scratch to your car.【Large Storage Space】: FIVKLEMNZ roof bag (46*34*17 inch) was designed to solve the problem of limited storage space in the car. 15 cubic feet rooftop cargo carrier allows you to hold 4-6 suitcases, travel luggage cases, tents, sleeping bags, and more. Free up inside vehicle space for more comfortable on the way.【Easy to Install】：FIVKLEMNZ rooftop cargo carrier fits for any car, truck, or SUV. If there is not roof side rails on your car, it can be quickly and easily installed to roof rack in minutes with 6 door hooks.【100% Refund or Replacement】：7x24 online customer support, ask us anything at any time. Backed by 30 days money-back guarantee and 12 months limited warranty. Product Description How to Install the Door Hooks? Step 1 Open your door and carefully pull back the weatherstripping seal. Step 2 With the seal pulled back, place one of the 4 included door hooks on the metal doorframe. Step 3 Applying gentle force, pop the weatherstripping seal back into place with your hand and close the door. Step 4 Apply the same procedure to the other doors. These hooks will safely anchor the rooftop cargo bag. Different Cargo Carrier Bags to Meet Your Different Needs on the Road Trip Size 46*34*17 inch 52*40*18 inch 59*24*24 inch 51*36*5 inch 60*20*6 inch Door Hooks 6 Door Hooks 6 Door Hooks None 6 Door Hooks None Straps 8 Straps 10 Straps 6 Straps 8 Straps 8 Straps Anti-slip Mat Yes Yes No Need Yes No Need Storage Bag Luggage Lock Is it a hard or soft shell carrier? Please note that it is a soft shell rooftop cargo carrier bag. More lightweight and compact than the hard shell carrier. It has a larger space. I don't have a roof rack, so can it be compatible with my vehicle? Yes, you can attach it to 4 door hooks. But you need to make sure that the weatherstripping seal on your car is removable, then you can install the door hooks. If I don't have a crossbar, how should I deal with the front and back straps? The front and back straps are removable. So you can remove the front and back straps directly. How can I attach the rooftop bag to the vehicle? Please don't worry. You can check the installation video then you will know how to install it.