Please don't buy them. They technically work in the sense that data can be copied to and read from them, but their write speed is around 600 KB/s. In other words, they're almost as fast as that crappy DSL line you paid for in 2004. I might have had a few bad ones, but I bought 20 and only one was able to write data at speeds over 10MB/s. I only have to fill them out and distribute them once, so technically they're not useless, but at the rate I'm getting, it takes about 3 hours to fill one out.
Compact and Convenient: SanDisk Cruzer Fit USB 32GB Flash Drive (SDCZ33-032G-A11)
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32GB SanDisk USB Flash Drive (SDCZ430-032G-A46)
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Sandisk Ultra Flair 128 GB Silver USB Flash Drive: Reliable and High-Speed Storage
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Titan Gray Samsung BAR Plus 256GB USB 3.1 Flash Drive (MUF-256BE4/AM) with Up to 400MB/s Transfer Speed
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8TB Seagate Backup Plus Hub Desktop Hard Drive with Data Recovery Services
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Game console Microsoft Xbox One X 1000 GB HDD, black
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2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
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18 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
95 Review