eTech 2.0 Mother Lode Mini 21 Wheeled Duffel Onyx. Based on overwhelming customer demand, we've built a carry-on version of the Mother Lode family - this 21.5 wheeled duffel is for the traveler who wants great packing flexibility as well as style. Check it out - it's got all of the best Mother Lode features jam-packed into a carry-on compliant size.