Why Carry-On Only Is Worth It
Checked bags now cost $35–$40 each way on most major airlines. For a two-week trip with one connection, that's $140–$160 round trip. Add the risk of lost luggage — roughly 6 in every 1,000 bags are mishandled, according to DOT data — and the case for carry-on only is obvious. The trick is packing for 14 days in a 40-liter bag. It's doable with a capsule wardrobe and a few smart gear choices.
The Capsule Wardrobe (14 Days, 7 Outfits)
Pack in one color family — navy, black, or olive — so everything mixes. My go-to: 3 merino wool t-shirts ($80 each, but they resist odor for 3–4 wears), 1 button-down, 2 pairs of pants (one travel pant, one jeans), 1 pair of shorts, 1 dress or nice top for dinners, 1 light sweater, and 1 rain shell. That's 9 tops/bottoms total. Add 5 pairs of underwear and 4 pairs of merino socks. Wear your bulkiest shoes (sneakers or boots) on the plane and pack one pair of sandals or flats.
Toiletries: The 3-1-1 Rule Without the Hassle
TSA allows 3.4 oz (100 ml) containers in a 1-quart bag. Buy solid shampoo and conditioner bars ($12 each) — they last 30+ washes and don't count as liquids. Decant sunscreen into a 3 oz bottle; you'll need it. Pack a travel-size toothpaste, deodorant, and a razor. Skip hotel shampoo — it's usually terrible. A hanging toiletry bag ($25 on Amazon) keeps your stuff off wet hostel counters.
Tech and Essentials That Earn Their Space
Bring a 65W USB-C charger ($30) that powers your laptop and phone, plus a universal adapter ($15). A 10,000 mAh power bank ($25) is non-negotiable for long walking days. Pack a folded tote bag for groceries and souvenirs. One travel umbrella ($20) beats a rain jacket hood in cities. And a small padlock ($8) for hostel lockers. Leave the laptop at home if you can — your phone handles bookings and maps fine.
How to Fit It All in a 40L Bag
Use packing cubes — two medium and one small ($20 for a set). Roll t-shirts and underwear; fold pants flat. Wear your heaviest layer on the plane. Stuff socks into shoes. Put toiletries in the bag's top pocket for easy security access. A 40L bag like the Osprey Farpoint 40 ($185) fits most European carry-on sizers (55 x 40 x 20 cm). Budget airlines like Ryanair charge £25–£50 for a bag over that size, so measure before you fly.
What to Leave Behind
Skip the 'just in case' items: extra shoes, a second jacket, a bulky camera, and full-size anything. You can buy toothpaste, sunscreen, and umbrellas anywhere in Europe for roughly the same price as at home. Laundry every 7 days — a €5 wash-and-fold in Lisbon or a $4 laundromat in Berlin resets your whole wardrobe. That's cheaper than checking a bag.