The USB Flash Drive shapes are as varied as you can imagine. Long before you get into the custom usb drives, you can begin your customization by finding the shape that best fits your brand or event. Some of the more popular flash drives are the twist, classic and compact. However, you can get a great custom look with the unconventional shapes as well. Some of the more fun shapes are the Key, dogtags, credit card and bottle opener. As a first step in customizing USBs, pick the shape that best suites your event.