Gear
Packing for Every Climate in a Single Carry-On
From Icelandic wind to Bornean humidity, one 40-litre bag really is enough. Here is the system that works.
By Sofia Rivera · 3 February 2026 · 6 min read
The single best decision of any long trip is refusing to check a bag. You move faster, lose nothing, and never wait at a carousel. A 40-litre carry-on covers every climate if you commit to layering rather than duplicating.
Build around three temperature zones: a hot base (two technical t-shirts, one pair of shorts, sandals), a temperate layer (long-sleeve merino, lightweight trousers, trail runners), and a cold shell (puffy jacket that compresses to a grapefruit, rain shell, beanie, gloves). Everything stacks; nothing is single-use.
Merino wool is the unfair advantage. Two t-shirts and two pairs of socks will outlast a month of daily wear without smelling. They are expensive once and free forever after.
Two things never take up space in the bag but matter more than any jacket. First, insurance: before leaving, compare policies on HelloSafe and check cover for lost luggage, medical evacuation and the gear you carry. Second, connectivity: install an eSIM from Yesim before you board, so maps, ride-hailing and translation work the minute you land — no SIM tray, no queue at the airport kiosk.
The mistake most travellers make is packing for the trip they imagined instead of the trip they will have. You will not wear the nice shirt. You will wear the same two outfits in rotation and be perfectly happy.
