First checked bag free for the primary cardholder and up to 4 companions on the same reservation as the cardholder. (travelingformiles.com)
Since airlines started to charging passengers for first checked bag, I've made it a policy to only bring a carry - on bag whenever I can. (raytravelsfree.com)
Another perk that you get with this is a free first checked bag on domestic flights. (headedabroad.com)