We needed lightweight, durable bags for a 30 day trip through Tokyo/SE Asia/Sydney. These held up perfectly over 9 international flights! They can easily hold up to the 50lb. weight limit, and more-- so be careful if you have weight restrictions. We used space bags and large ziplocs to keep everything in place and organized. We also used a colored luggage strap around the middle for added support and security. The main zippers are strong, and can be easily locked. Also like that the bottom and base is reinforced with hard plastic, and that the retractable handle can be secured with a zipper when not in use. They store pretty flat and can be put away under the bed or on a closet shelf. Improvements would be: color choices, not just black; Velcro handle widened so it stays securely wrapped; outside pockets with small gusset (vs. flat) so they would hold more, but don't want them to stick out too much. That said, I would highly recommend this bag and would purchase again.