A Grey suitcase badge on Contacts, signifies the location is a travel location in the time period specified in the filter but is not "current". (now, +/- 24 hours).

A Purple suitcase badge on a Location on the map, signifies the location is a "current" travel location on the map.  (Now +/- 24 hours)

A Purple travel badge on the card view for the contact indicates the Contact is an active traveler. The traveler has travel current locations (Now +/- 25 hours)

A Gray travel badge on the card view for the contact indicates the Contact is a traveler and has "past" or "future" travel location in the time period specified in the filters.

If a Contact's location is not a travel location, no suitcase badge is shown.