It’s so easy to pack beyond the 50-lb limit that airlines, trains, and buses limit you to. I’m a light packer and don’t usually worry about being over, but just in case, I ordered this portable luggage scale. I used it recently on a train trip, and this gadget matched exactly to Amtrak’s scales.
I hooked the strap through the handle of my bag and lifted it. 33 lbs.
This is an inexpensive item that will give you one less thing to worry about.