Get a box instead
This bag is good for the price when you compare it to the rigid boxes, but it's a pain to use.  The zipper is durable, but it has to be because of the amount of force it takes to operate it after the bag has been exposed to the elements.  We used it on a 900 mile road trip through a blizzard (yes, we're stupid).  After the road salt and snow and freezing weather took hold of it, it was nearly impossible to operate.  If you've got the money, go with the rigid box.
Rating: 3 stars