Most packing mistakes happen before a single shirt goes into the suitcase: travelers assume a bag size or liquid limit that their specific airline does not actually use. The rules below come from aviation industry guidance and an airline's own baggage policy, followed by packing techniques tested by a luggage manufacturer.
Check Carry-On Size, Liquids and Batteries First
The International Air Transport Association (IATA) notes that many airlines cap carry-on bags at around 56 × 45 × 25 cm (22 × 18 × 10 in), including wheels and handles, with weight allowances commonly starting near 5 kg (11 lb) depending on the carrier and cabin class. IATA stresses this is only a general reference, since baggage allowances remain airline-specific.
Delta Air Lines' own carry-on policy illustrates that point: its limit is a combined 45 linear inches (114 cm), with individual bag dimensions not exceeding 22 x 14 x 9 inches — narrower than IATA's general reference figure. Delta allows one carry-on plus one free personal item, and jackets, umbrellas and duty-free purchases do not count against that allowance. On Delta Connection flights with 50 seats or fewer, only personal items are permitted in the cabin; larger carry-ons are gate-checked.
Delta's policy page also confirms the liquids rule travelers encounter at US security checkpoints: liquids, gels, aerosols and pastes must be 3.4 ounces (100 ml) or less per container and fit inside one quart-size, clear, zip-top bag. Inflatable wedges, knee defenders and foot hammocks are listed as prohibited comfort devices on Delta flights.
For batteries, IATA states plainly that "spare batteries are not allowed in checked baggage." Power banks and spare lithium batteries for phones, cameras or laptops should stay in the carry-on bag, not inside a suitcase that goes in the hold; whether a specific battery can be carried at all depends on its configuration and watt-hour rating, detailed in IATA's dangerous goods guidance.
Match the Packing Method to the Fabric
Luggage maker Briggs & Riley outlines several packing methods, each suited to different garments and trip lengths.
Packing methods and what they suit| Method | How it works | Best for |
|---|
| Rolling | Lay item flat, fold sleeves inward, roll tightly from bottom to top | Casual wear: t-shirts, jeans, lightweight sweaters |
|---|
| Bundle wrapping | Structured items placed flat in a crisscross pattern at the base, built around a soft core, then folded over like a package | Jackets, trousers, wrinkle-prone structured pieces |
|---|
| Folding and layering | Garment-specific folds, stacked by category with heavy items at the base | Mixed wardrobes, general trips |
|---|
| Compression | Compression cubes or vacuum-seal bags squeeze out air and bulk | Long trips or multiple climates |
|---|
| Fashion-forward | Garment folders and tissue paper separate delicate layers | Statement pieces, formalwear |
|---|
Briggs & Riley notes that no single method suits every traveler — the right choice depends on trip length, climate range and how wrinkle-sensitive the clothing is.
Step-by-Step: Loading the Suitcase
- Lay out everything you plan to bring and remove duplicate items before any folding begins.
- Separate clothing by category — tops, bottoms, underwear and socks — assigning one packing cube or section per category.
- Roll casual, soft items such as t-shirts and knitwear; fold or bundle-wrap structured pieces such as blazers and trousers.
- Place heavier items, such as shoes and toiletry kits, at the base of the suitcase near the wheels.
- Stack rolled clothing and packing cubes on top of the heavy base layer, pressing cubes together so nothing shifts in transit.
- Slide dry-cleaning bags or tissue paper between delicate or structured garments to reduce creasing.
- Fit shoes and small extras along the suitcase edges or in built-in compartments rather than the main compartment.
- Pack liquids in a single quart-size clear zip-top bag, each container 3.4 oz (100 ml) or less, for easy removal at security.
- Keep spare batteries and power banks in carry-on, not in a bag destined for the hold.
- Weigh the finished bag before leaving home to check it against your airline's checked-bag limit.
Checked-Bag Weight: Avoiding Extra Fees
On weight, IATA recommends that individual checked bags stay under 23 kg (50 lb) for health and safety reasons tied to baggage handling, though it notes the maximum permitted weight in many regions reaches 32 kg (70 lb). On US and Canada routes specifically, baggage is commonly measured by a "piece concept" with a combined length-plus-width-plus-height limit of 158 cm (62 in) per bag.
- Carry-on size varies by airline — IATA's reference figure and Delta's actual limit differ by several inches, so check your specific carrier.
- The TSA 3-1-1 liquids rule applies at US checkpoints: 3.4 oz (100 ml) per container, one quart-size clear bag, one bag per traveler.
- Spare batteries and power banks must travel in carry-on luggage, never in a checked bag, per IATA.
- Roll soft casual clothing and fold or bundle-wrap structured pieces to balance space-saving with wrinkle control.
- Weigh checked bags before departure — IATA's 23 kg reference is common, but some airlines permit up to 32 kg for a fee.
Questions
- How much liquid can I bring in my carry-on?
- Under the TSA 3-1-1 rule confirmed on Delta's carry-on policy page, each liquid, gel, aerosol or paste container must be 3.4 ounces (100 ml) or less, and all containers must fit in a single quart-size, clear, zip-top bag — one bag per passenger.
- Is there one standard carry-on size for all airlines?
- No. IATA's general reference figure is 56 × 45 × 25 cm (22 × 18 × 10 in), but individual airlines set their own limits — Delta's current carry-on limit, for example, caps individual dimensions at 22 x 14 x 9 inches, which is narrower than IATA's reference.
- Can I pack a power bank in my checked luggage?
- No. IATA states that spare batteries are not allowed in checked baggage; power banks and spare lithium batteries must stay in carry-on baggage instead.
- Should I roll or fold my clothes?
- According to luggage maker Briggs & Riley, rolling suits casual, soft items like t-shirts and knitwear, while folding or bundle-wrapping better protects structured pieces such as blazers and trousers from creasing.
- How heavy can a checked bag be before I pay extra?
- IATA recommends individual checked bags stay under 23 kg (50 lb) for handling safety, though it notes some regions permit up to 32 kg (70 lb); exact free allowances and overweight fees are set by each airline.
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