If you want to keep things safe inside the boot and roof, have a look at the different fixture systems SEAT Accessories has developed to make sure nothing starts dancing down there. Fastening strap kit Reference: 000017770 For light load transportation; includes 2 wide and 2 narrow straps with tensioning mechanism to fix objects onto roof bars or inside the boot.                 Ratchet fastening strap Reference: 000017771 For securing heavy loads; includes a hook and a tensioning mechanism to fix securely and effortlessly.