The Outer Material Is A Combination Of Soft Neoprene Material To Protect Your Paint And Durable Nylon For Long Life. Features 4 Tie Down Points To Make Installation Easy And Secure. (54 x 48 x 20) 20 CuFt.  

Auto Backpack Roof Top Storage System

This system comes in two different models, depending on your cargo
requirements. The outer material is a combination of soft neoprene
material to protect your paint and durable nylon for long life. Each Auto
Backpack features four tie down points to make installation easy and
secure. Designed to provide quick alternative storage, these easy to use
and store roof top storage bags are a must for those road trips. With 13
or 20 cubic feet of storage space, this is a perfect alternative to those
expensive and hard to store plastic pods.