I have regular tags (<a data-hook="product-link-linked" class="a-link-normal" href="/Swiss-Gear-Luggage-Tags/dp/B004MKMHAK/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Swiss Gear Luggage Tags</a>&nbsp;for securely marking my bags.  But those are a bit discrete and perhaps too common.  These Pan-Am tags are brightly colors, cool looking, and large enough to be instantly visible.  I have them on my carry-on baggage for quick visibility for overheads too.  Love 'em.