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SanDisk Cruzer Fit
Gone are the days of USB flash drives having to be big things. The SanDisk Cruzer Fit is the smallest USB flash storage drive that I have seen and sticks out of the USB port just enough to remove it.
I went with the 32GB version to augment the 256GB on board solid state drive.
Price: About $20.
Image source: SanDisk.
Apple Thunderbolt to Ethernet adapter
In an effort to make the MacBook Pro as thin as possible, Apple has done away with the gigabit Ethernet port. So this isn't something that I use all that often—Wi-Fi has all but replaced it—but there are times when I have to resort to a wired connection.
This is where Apple's Thunderbolt to gigabit Ethernet adapter comes in handy. I can throw it into a notebook bag and it's there waiting for me when I need it.
Image source: Apple.
Twelve South PlugBug
I love my gadgets, but more gadgets means more chargers, which in turn means having to have more wall outlets.
The Twelve South PlugBug solves this problem by combining the MacBook Pro charger with a 2.1A USB charger. The output of the USB charger is powerful enough to charge an iPad, which means having to carry one less wall wart.
Image source: Twelve South.