Ebook readers - I've been using them for years, and recent models with flat bezels are very much designed to break, but it makes reading electronic documents so much nicer than bright backlit screens. I've resigned myself to buying a new one every year until the technology comes out of patent and readers get nice unbreakable screens like modern cellphones.
Retractable metal poker - got this off Amazon for my weed paraphernalia, listed as a metal toothpick. It's incredibly useful and has saved my ass countless times. Need to poke that reset button? Scrape some gunk out of a USB port? Clean your nails? It's good for everything except picking your teeth, which is just unnerving.
Fridge-magnet box opener - not really a game-changer, but very convenient!