Is the rain cover included?
Yes! It comes in the front pocket (with the umbrella icon).
What size of racks do you need to add the additional inserts for?
If your rack is between 6-8mm (on the small/skinny side), the extra blue inserts will make a nice tight fit for the clips to hook on your rack. If your rack is between 8-12mm (which most are), the hooks should work great without the inserts.