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Fisher Space Pen
Probably the most reliable pen I've ever owned. Not only can I safely carry it around in my pocket without fear that it will leak, it's very reliable and will write on almost any surface, and at any angle.
Link | Price: Varies.
(Image: Fisher Space Pen Company)
3M Scotch-Brite microfiber cleaning cloth
Wipe fingerprints off your devices without causing scratches and smearing the grease.
What more is there to say? The description may be short, but these cloths are awesome.
Link | Price: Around $5.
Kingston DataTraveler Ultimate G3 USB 3.0 flash drive
The Kingston's DataTraveler Ultimate 3.0 G3 features USB 3.0 technology, which enables incredible data transfer speeds up to 150MB/s read and 70MB/s write when using USB 3.0. Sizes ranging from 32GB to 128GB.
Fast, solid, reliable.
Link | Price: Starting at $35.
(Image: Kingston Technologies)