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Non-essential, sort of silly, luxury?
Easy: Android smartphone (with it's accessories: spare batteries, IEMs, and a lightweight Gorillapod).
I keep it in airplane mode, to conserve battery, and even in airplane mode, I find many luxuries in it. This one devices gets me:
Porn.
Music.
E-Books.
Movies, or episodes of shows stored on the SD card.
More porn.
Camera.
Video camera.
Guide to the stars.
Porn for fapping before sleep and upon waking.
Wikipedia--downloaded to my SD card, so no data connection is necessary. I mean the text of EVERY article, sans pictures, is stored on my SD card, and searchable with an app called Fastwiki.
Did I mention porn?
Pic related. The luxury of spending an afternoon at my campsite laying about while reading a book while listening to music and occasionally taking pics of the sky and trees above me.