Purchased my 21” Maxlite Air specifically to make the switch to Carry-On Only air travel. Had just returned from nearly 3 weeks in France and due to airline chaos in summer 2022 we went carry on only. My wife had a small roller but I had 40L Patagonia Black Hole Duffel which was great but a pain to lug through airports.The Maxlite gives me the same capacity, in a very lightweight hard sided 4-wheel roller. Super high quality and bang for your buck, consistent with all the reviews I had read. Also gives the option to expand it 2” in depth if you wanted to do some shopping and then check the bag on way home. I’ll update my review after our next trip this fall but it is ALL a question of capacity for me so I did a packing test-run.I’m a slim shorter guy (small shirts, 29/30 pants, size 7 shoes) so judge accordingly about quantities. But as per photo attached, I determined the max I can bring as: 8-10 tees/polos, 6-7 button-up shirts, 1 light sweater, 4-5 shorts/swim trunks, 4-5 pants, 1 blazer, 2 jackets, 3 belts, 10 underwear, 12 socks, 2 pairs of shoes and 1 pair of sandals. That includes what I wear on the plane (jeans, tee, sweater, jacket, 1 of the pairs of shoes). But everything else went in the suitcase, along with sunglasses, lint roller and electric razor…and that is NOT expanded. That’s up to 18 tops…and therefore 18 outfits, making Carry-On only a totally realistic option for ANY length of trip, especially if you had a Vrbo or Airbnb with laundry. I will add a third pair of shoes in my small daypack “personal item” along with my toiletries and electronics.So it had surprising capacity and was still very lightweight when full. The right hand side that has the handle beneath has less space kind of in 3 little channels, so pack accordingly with shoes etc slotted in between.The Maxlite Air 21” was below all the carry on dimensions for all airlines I checked and I looked at pretty much all the Canadian, American, and European carriers, including discount ones like Easyjet and Ryanair.I’m officially converted to traveling light…and the TravelPro seems to be the perfect fit to make it a more comfortable walk through airports or along city streets. Again will update after my first trip…but hope the above info is useful for anyone who (like me) was very hesitant to ditch the checked luggage.