When you received your new Performance Bag, it comes collapsed. Included in you rack bag, you will find two white stabilizing bars.
On the inside of your Performance Bag, towards the top of the front and back of the bag, you will see a long, skinny zipper pocket. Simply place the white stabilizing bars into these pockets (it is okay to bend the poles slightly to insert them) and zip the pockets closed.
You can also watch the video below for assembly instructions.