Checking a bag costs $35–70 per flight, adds 45 minutes to every airport visit, and creates the chance of lost luggage. After traveling carry-on only for 3 years across 30+ countries, I can tell you: you don't need more than a 40L backpack for any trip up to 2 weeks.
Here's the exact system.
The Universal Packing List
Clothing (fits in a single packing cube):
- 5 t-shirts/tops (merino wool or quick-dry — wash 2, wear 2, dry 1)
- 2 pairs pants/shorts (1 for walking, 1 for going out)
- 1 light jacket or hoodie (layers beat heavy coats)
- 7 underwear + 4 pairs socks
- 1 nice outfit for restaurants/nightlife
- Swimwear (doubles as gym shorts)
Shoes (wear the bulkiest, pack the other):
- Walking shoes (worn on the plane)
- Sandals or slip-ons (packed)
Toiletries (3-1-1 compliant):
- Solid shampoo bar (lasts months, no liquid limits)
- Toothbrush + small toothpaste
- Deodorant, sunscreen, moisturizer (all in 100ml containers)
- Razor
Tech:
- Phone + charger + universal adapter
- eSIM (no physical SIM hunting — see our eSIM guide)
- Power bank (under 100Wh for carry-on)
- Earbuds
Documents:
- Passport
- Digital copies of everything (email yourself scans)
- 1 credit card + 1 debit card + $100 USD emergency cash
The Wash-and-Wear System
The secret to carry-on travel isn't packing less — it's washing more. Every 3 days, hand-wash 2 shirts and a pair of underwear in the sink with a dime-sized drop of Dr. Bronner's soap. Wring them in a towel and hang overnight. Dry by morning.
In tropical destinations (Southeast Asia, Caribbean, Central America), clothes dry in 3–4 hours. In cold climates, use a heated towel rack or drape over a radiator.
Merino wool changes everything. It doesn't smell after 3 wears, dries fast, and regulates temperature. One $40 merino t-shirt replaces 3 cotton shirts in your bag.
Destination-Specific Adjustments
Tropical (Thailand, Bali, Colombia, Dominican Republic):
- Drop the jacket, add a rain shell ($50, packs to fist-size)
- Linen or loose cotton instead of jeans
- Extra swimwear
Cold Weather (Europe winter, Japan autumn):
- Wear the puffy jacket on the plane (doesn't count as carry-on)
- Pack thermals (1 top, 1 bottom — worn under regular clothes)
- Swap sandals for lightweight boots
Business/Mixed (city trip + meetings):
- Pack 1 wrinkle-resistant button-down
- Dark jeans that work for both casual and smart-casual
- Collapsible dress shoes exist and weigh nothing
The Bag
Any 40L backpack with a clamshell opening works. The most popular options:
| Bag | Size | Price | Best For |
|---|---|---|---|
| Osprey Farpoint 40 | 40L | $160 | Best overall |
| Tortuga Outbreaker | 45L | $250 | Max carry-on size |
| Patagonia Black Hole | 40L | $129 | Durability |
| Decathlon Forclaz | 40L | $70 | Budget |
Packing cubes are mandatory. They compress clothes by 30% and keep everything organized. A set of 3 costs $15–25 on Amazon.
What You Don't Need
- A "just in case" outfit (you won't wear it)
- More than 2 pairs of shoes
- Full-size toiletries (buy at destination if needed)
- A laptop (unless you work remotely — your phone does everything else)
- Travel pillow (use a bundled hoodie)
- Guidebooks (your phone has everything)
The Real Benefit
Carry-on only isn't about minimalism — it's about freedom. You skip baggage claim. You walk past the luggage carousel. You can take a spontaneous day trip without worrying about your suitcase. You move faster, cheaper, and lighter.
And when you arrive somewhere new, a Local Friend can meet you right at the metro exit instead of waiting while you drag a suitcase through the terminal.
Browse Local Friends on Roavi and start your next trip lighter.