We switched to these many years ago. We use Amtrak mostly and wanted something that would roll easily down the aisle of a train car but big enough to pack our stuff for 9-12 night trips. We each have a heavy canvas duffle with wheels on one end, about 48 inches long and as others have stated, you have to watch the weight, Amtrak allows 50 pounds and I can easily go over that. There is so much room, since the sides will buldge out, packing is easy, I use travel space bags, no vacuum needed and wife does the same. We each have a rolling duffle and a small carryon, that's it. They are a real chore to carry and you can throw the shoulder strap away but the wheels are a god send, just mark the end opposite the wheels so you know which end to grab and go. We'll never own anything but these from now on. They can take alot of abuse, tossing and stackingv and wear like iron, wheels are well protected, hard round and solid and have had no trouble anywhere, even pulling it thru the Ohio snow. We don't put valuables in them or a lock, you can cut it or just take the whole thing so we're not that thief protected and have no issue there either.