To promote the new first bag checked free perk with the Delta SkyMiles Credit Card, American Express is giving away a standard piece of “designer” luggage to the first 200 folks to turn in a used bag at the Minneapolis Aquatennial Best Days of Summer Fireworks Saturday, July 24 from 5:30 to 11 p.m. Drop off is at the corner of West River Parkway and Portland Ave. You don’t have to be a cardholder to participate.