long-haul flight comfort kit

80 flights a year built this list, not a packing article

01
compression socks
wear them, don't just pack them. put on before boarding not mid-flight
02
inflatable neck pillow (not the foam kind)
packs flat, foam ones eat half your bag for nothing
03
eye mask with a contoured nose bridge
04
Loop earplugs, not the foam ones
reusable and actually block engine noise, stopped bothering with the disposable ones years ago
05
electrolyte packets
cabin air is drier than you think, plain water isn't enough on a 12+ hour leg
06
a real toothbrush, not the tiny hotel one
07
lip balm with SPF
08
a second phone charger cable, dedicated to the bag
gate-checked once, never again - lost mine and it's not worth the risk
09
a compact battery pack, charged before departure
10
an empty collapsible water bottle to fill after security
11
one change of clothes in the carry-on
for missed connections, not for the flight itself
12
wet wipes, unscented

Or start a list of your own. Free, it takes a minute.