Most packing lists are useless. They tell you to bring “a few t-shirts” and “comfortable shoes.” That’s not a requirement. That’s a suggestion from someone who has never missed a flight because their bag was two pounds over the limit.
Packing list requirements are hard rules. Airline weight limits. Liquid size restrictions. Bag dimensions that get you through the gate without paying a $75 fee. If you’re building a packing list, start with the constraints, then pick the stuff.
Airline Weight and Size Limits — The Non-Negotiable Starting Point
Before you pack a single sock, check your airline’s specific baggage policy. Not “most airlines.” YOUR airline. The difference between a 22-inch carry-on and a 21.5-inch carry-on costs you $50 at the gate.
Here’s the real data for major carriers in 2026:
| Airline | Carry-On Max Size | Carry-On Max Weight | Checked Bag Max Weight |
|---|---|---|---|
| Delta | 22 x 14 x 9 in | No limit (must lift yourself) | 50 lbs |
| American | 22 x 14 x 9 in | No limit (must lift yourself) | 50 lbs |
| United | 22 x 14 x 9 in | No limit (must lift yourself) | 50 lbs |
| Ryanair | 15.7 x 11.8 x 7.9 in (free) | 22 lbs | 44 lbs |
| EasyJet | 22 x 17.7 x 9.8 in | 33 lbs | 50 lbs |
| Emirates | 22 x 15 x 8 in | 15 lbs | 50 lbs |
The Away Carry-On (21.7 x 13.7 x 9 in, $295) fits nearly every US airline but fails Ryanair’s free sizer. The Osprey Farpoint 40 (22 x 14 x 9 in, $190) is a backpack that matches most limits and weighs under 3 lbs — giving you more weight for actual stuff.
Buy a luggage scale. The Etekcity digital scale costs $12 and saves you from repacking at the airport. That’s a packing requirement nobody talks about.
TSA Liquids Rule — The Most Annoying Constraint That Everyone Gets Wrong
The rule is simple: 3.4 ounces (100ml) per container. All containers fit in one quart-sized bag. One bag per passenger.
Here’s what people mess up:
- Deodorant: Solid deodorant is not a liquid. Gel deodorant is. Pack solid and skip the bag drama.
- Toothpaste: Travel tubes are 3.4 oz or less. The full-size Colgate tube is 6 oz. Don’t bring it.
- Sunscreen: A 3.4 oz bottle lasts about 4-5 days of face application. For a two-week beach trip, check a larger bottle or buy at destination.
- Contact solution: The 4 oz bottle from Walgreens is over the limit. Buy the 2 oz travel size.
The Monos Carry-On ($275) includes a built-in compression system and a dedicated shoe bag. Smart design, but it doesn’t change the TSA rule. You still need the quart bag.
One trick: pack a reusable silicone bottle set. The Humangear GoToob (3.4 oz, $12 for 3) is leak-proof and TSA-compliant. Fill with your own shampoo and conditioner. No guessing.
Clothing Requirements — Stop Packing “Just In Case” Stuff
The failure mode here is fear. You pack for every possible weather scenario and end up wearing 40% of your clothes. The requirement is simple: pack for the worst realistic weather, then subtract one outfit.
For a 7-day trip to Europe in spring:
- 3 shirts (one long-sleeve, two short-sleeve)
- 2 pants (one jeans, one chino or travel pant)
- 1 sweater or light jacket
- 5 pairs of underwear and socks
- 1 pair of comfortable walking shoes (wear on the plane)
- 1 pair of sandals or dress shoes (pack)
That’s 14 items total for a week. Wash a shirt in the sink on day 4. It’s dry by morning. The Uniqlo Airism line ($15 per shirt) dries in 2 hours flat. Merino wool socks from Darn Vermont ($25 per pair) can be worn 3-4 days without smelling.
Do not bring jeans that weigh 2 lbs each. Do not bring five pairs of shoes. Do not bring a hair dryer — every hotel has one.
Tech and Documents — The Stuff You Actually Can’t Replace
This section is short on purpose. Most tech packing advice is overblown. You don’t need a portable printer or a backup laptop. Here’s what you actually require:
- Passport — valid for at least 6 months beyond your return date. Check this now.
- Phone and charger — the Anker 511 Power Bank ($26, 10,000 mAh) charges a phone twice. Enough for a day of exploring.
- Universal adapter — the Ceptics World Travel Adapter Kit ($22) covers 150+ countries. Do not buy the $5 gas station version. It will spark.
- Wallet with backup card — carry a second debit or credit card in a separate bag. If your wallet gets stolen, you’re not stranded.
That’s it. No Kindle. No tablet. No camera unless you shoot professionally. Your phone does all of it.
The One Requirement Nobody Talks About — Weight Distribution
You can have a bag that fits the size limit and still fail the gate test because it’s too heavy to lift into the overhead bin. Airlines are starting to enforce weight more strictly, especially in Europe and Asia.
The solution: pack heavy items at the bottom of the bag, close to your back (if using a backpack). For a wheeled suitcase, put shoes and toiletries at the wheel end. Clothes on top. This keeps the bag balanced and easier to lift.
The Osprey Porter 46 ($180) has compression straps that pull the load closer to your spine. It feels 5 lbs lighter than it is. That’s engineering, not magic.
If you’re flying Ryanair or EasyJet, buy a bag that’s under 3 lbs empty. The Eagle Creek Wayfinder 40L ($160) weighs 2 lbs 12 oz. That leaves you 19 lbs of actual stuff for a 22 lb limit.
Final verdict: Start with the airline limits. Buy a scale. Pack 14 items for a week. Wash clothes. Skip the extras. The Osprey Farpoint 40 is the best all-around bag for most travelers because it fits limits, weighs almost nothing, and carries like a real backpack. Stop overthinking it.
