AARP has a sister site called Ethel where they're offering a free Ethel-on-the-Go luggage tag. This 4.5″ x 2.5″ pink tag is quite distinct, making it easier for you to not grab the wrong suitcase off the conveyor belt.
You'll need to create a free AARP account (which you might already have if you've previously redeemed their massively discounted subscription). Then add the luggage tag to your cart and use promo code ONTHEGO during checkout. The total freebie should hit $0.00 once you reach the second page of checkout and it'll look like this.