1. Sentimental value
It took only three trips to LaGuardia and back on the subway, lugging around my unwieldy heavy bag, before I was done with anything that didn’t have a purpose or weigh less than a few ounces. This included a deck of cards that a friend from London brought me, the external microphone my boyfriend gave me for Christmas last year (that I’ve never used but felt too bad to leave behind), and the two expired passports I usually bring along for good measure.
All items of sentimental value have been intermittently packed into flat-rate USPS boxes and shipped to my parents, to be collected and re-examined whenever my traveling ends.