Like many other USB flash drives, the Lexar JumpDrive M20 Mobile comes packaged in a cardboard blister pack. The front of the card advertises many of the M20 Mobile's key features including its capacity, rated read speed and its ability to transfer files between devices using its USB 3.0 and micro-USB connectors. The back of the card provides a bit more information regarding the M20 Mobile's features and capabilities.
The M20 Mobile is definitely one of the larger flash drives in Lexar's lineup. Measuring 51.9mm long, 25mm wide and 13.2mm thick with its USB connectors retracted, it's a little smaller than a pack of Tic Tacs. While you probably wouldn't want it hanging off of your keychain, the M20 Mobile easily fits in a pocket or purse.
The body of the M20 Mobile is constructed out of lightweight, white plastic and is branded with a couple of Lexar logos. The drive also shows its capacity and support for USB 3.0. To brighten things up a bit, Lexar has used clear blue plastic for one of the ends and the slider button. The clear plastic lets you see the M20 Mobile's internal LED, which lights up during a data transfer.
One of the M20 Mobile's more unique features is its thumb slider design which has a USB connector on each end. By sliding the mechanism to one side or the other, the drive's micro-USB and USB 3.0 connectors are exposed. Otherwise, they can both be retracted by placing the slider in the middle. While the theory behind the M20 Mobile's thumb slider is sound, it didn't work as well as I would have liked. The slider was hard to move at times and when the connectors were exposed it didn't always want to lock into place.