It's a double zip meaning that you can slide around both zippers to the point in the box that you want to access, and open it up just where you want it rather than having to unzip the whole lot.

I'm not sure that the rigid inner material is, but it is encased in the same durable material as the rest of the box. On a recent trip to Mull we managed to get into the box: a 3-person inflatable kayak, two tents, all our sleeping bags and thermarests, as well as a large gas cylinder, football, and plenty of other bits and pieces. Thule Motion XT Roof Boxes - Family sized cargo carrier ideal for luggage, outdoor gear and bulky loads.I contacted the company with a request for a specific part of the locking mechanism for my roof boot, sending some pictures. We are very flexible with our deliveries and will aim to deliver to an address which suits you – this does not need to be your home address. Attach these and pull the cords to tighten them and it compacts everything further and takes any stress off the zips. When you are finished with the Thule roof box, you can take it off the roof, fold it back up, and put it in the storage bag for added protection.

With the 8 threaded bolts now projecting through the base of the roofbox it's a relatively simple matter of fitting the 4 plastic automatic locking devices to them. It's actually more of a foldable roof bag, with a semi rigid base and sides, but let's not be picky, it does what it's meant to do and it does it well. Important- Always check that the product that you require spares for is the same model as represented by the exploded diagram below. Designs that take the strain out of this process earned points; boxes with dual side opening let you get at fixings from either side.

It is not too difficult to clip everything together, but the force in doing so and the weight of pieces when detached lead to risks of scratches to paintwork. These are very clever devices which grip the threads on the bolts to keep the box from moving when tightened.