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The amount of data a USB flash drive can hold depends on its size. For instance, a 1 GB USB flash drive holds 980 MB of storage, with the remaining 20 MB devoted to the firmware needed for the drive to work properly.Source:
by usb2u on September 26th, 2011
It depends how big a flash drive you buy and more importantly if you buy flash drives that have not been "masked".
Whichever size you buy you're never going to get access to 100% of it because a small proportion is always used for the File Allocation Table - its the same with the hard drive in your PC - if you buy a PC with a 500GB HDD then some of it will be set aside for the FAT (which is a bit like a directory listing of what is stored where on your HDD) - same applies on the flash drive.
Where you can get caught out is buying say a 1GB flash drive that has been made using a Grade B chip with say only 600MB of usable storage - this is a "masked" flash drive and if you have one you'll have been scammed.
If you're buying for a business or school then I'd check out http://www.usb2u.co.uk
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