Best travel pillowFor the nine-hour flight before day one
Trtl Travel Pillow
Actually supports the head sideways, which a U-shaped pillow does not — it looks like a scarf and some people find it too warm to wear for a long flight.

Flight compression socks
15-20 mmHg, knee-length
Arriving with swollen feet and then putting on trekking boots the next morning is a genuinely bad start — these fix that for the price of a coffee, and they are tight enough that some people cannot stand them.
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Do not buy this if: Anyone with a circulatory condition who has not asked a doctor about compression first.
Everything else we recommend in flight comfort, including the ones we think suit a different trekker.
Best travel pillowTrtl Travel Pillow
Actually supports the head sideways, which a U-shaped pillow does not — it looks like a scarf and some people find it too warm to wear for a long flight.