The Ultimate Carry-On Packing List for Any Climate

The secret to carry-on-only travel isn't packing less — it's packing smarter. After years of testing gear across every climate, here's the definitive list that works whether you're heading to a Thai beach or an Icelandic glacier.

Start with your base layers. Three merino wool t-shirts are the foundation of any travel wardrobe. Merino is naturally antimicrobial (meaning it won't smell after multiple wears), temperature-regulating, and quick-drying. Invest in quality here — brands like Wool&Prince or Outlier make shirts that look like normal tees but perform like technical gear.

For bottoms, pack two pairs of versatile pants. One pair of slim-fit travel pants that look dressy enough for a nice dinner but stretch enough for a hike. One pair of shorts that double as swim trunks. That's it. You don't need jeans — they're heavy, slow to dry, and take up half your bag.

Layering is everything for climate versatility. A lightweight down jacket packs into its own pocket and handles temperatures down to 40°F. Add a packable rain shell on top and you're covered for anything short of a blizzard. For warm climates, the rain shell doubles as a windbreaker on breezy evenings.

Footwear: one pair of comfortable walking shoes that look decent enough for restaurants (Allbirds or similar), and one pair of flip-flops or sandals. That's two pairs total. Wear the bulkier pair on the plane.

Toiletries go in a clear quart bag. Solid toiletries (shampoo bars, solid deodorant) save space and avoid TSA drama. A quick-dry microfiber towel takes up a quarter of the space of a regular towel and dries in an hour.

The gear that earns its space: a packable daypack for day trips, a universal power adapter, a portable charger, and packing cubes to keep everything organized. Packing cubes alone will change your travel life — they compress clothes by 30% and keep your bag from becoming a chaotic mess.

The golden rule? Lay everything out, then remove a third of it. You'll never wear as much as you think you will, and you can always buy something locally if you really need it.