For the purposes of our car seat select tool, travel friendly means the car seat meets one or more of the following: is designed specifically for travel (such as clek liingo), has a European belt path, is a car seat/stroller combination (such as Evenflo Shyft DualRide), or for larger car seats like convertibles and all-in-ones, it must be lightweight (defined as under 12lbs for the purposes of this tool).