Make sure it has a USB-C connector (not only USB-A) so it works with your USB-C device. Check the interface / speed: many USB-C flash drives use USB 3.2 Gen 1 (or USB 3.1 Gen 1) which gives much better speeds than old USB 2.0. Capacity is labelled as 64 GB, but the usable storage will be slightly less.
Beware of very cheap drives with fake capacity or poor quality. As one article warns: “If you’re offered significantly higher capacity for very low price… alarm bells should be ringing.” Consider compatibility with your device (smartphone, laptop) and whether your phone supports OTG (if you intend to use it with phone). Some USB-C flash drives target mobile devices.
Decide what speed you need. If you’re just transporting documents/photos, moderate speed is fine. For large files or video, you’ll benefit from higher read/write speeds.