I have a BJ's car rental wallet card. It was on a flyer advertising all their car rental discount codes, coupons, etc., at the front of BJ's (I was there with my sister, who is a member). I was told by the person in their travel area that it would identify me as a BJ's shopper- whatever that means! I always carry it with me if I am renting using a BJ's code in case I am asked for some kind of member ID, but so far I've never been asked.