Carry-On Rules for Connecting Flights
One bag, two airlines, two sets of published limits. The tighter one decides your trip - and it is rarely the one you booked through.
We have not tested this gear. Every figure here is compiled from published manufacturer specifications and published airline policies, and the arithmetic is public so you can check it. This page contains affiliate links — see the affiliate disclosure.
On a connecting itinerary, the tightest published limit among your carriers governs the whole trip. Your bag has to clear the strictest one, because it is the same bag on every leg. That limit is rarely the airline whose website you booked on.
| # | Product | Published box | Fits | Score | Price |
|---|---|---|---|---|---|
| 1 | Eagle Creek Cargo Hauler Duffel 40LA duffel that will actually pass a gate sizer | 22 × 12.5 × 9 in | 11 of 11AA DL UA WN … | 8.9 | Check price on Amazon#ad How we earn |
| 2 | Osprey Farpoint 40 Travel PackOne-bag travel on any carrier that measures | 21.7 × 13.8 × 9.1 in | 4 of 11WN F9 G4 SY | 7.2 | Check price on Amazon#ad How we earn |
| 3 | LEVEL8 Road Runner Carry-On (20 in)Anyone who wants a front laptop pocket on a hard shell | 21.5 × 14.4 × 9.2 in | 4 of 11WN F9 G4 SY | 4.7 | Check price on Amazon#ad How we earn |
| 4 | American Tourister Airconic Carry-On SpinnerHawaiian's 25 lb carry-on cap, and anyone lifting a bag overhead unaided | 21.7 × 15.8 × 7.9 in | 4 of 11WN F9 G4 SY | 3.8 | Check price on Amazon#ad How we earn |
| 5 | Rockland Melbourne Hardside Spinner (20 in)Flying carriers that actually measure, and packing light on purpose | 20 × 13 × 10 in | 4 of 11WN F9 G4 SY | 3.1 | Check price on Amazon#ad How we earn |
No live price is currently verified, so every button here reads Check price on Amazon rather than a number we cannot stand behind. See how we handle prices.
One bag, several rulebooks
This sounds obvious written down and it is routinely missed, because people check the baggage rules of the airline they booked with and stop.
A ticket sold by a US carrier can be operated on one leg by a partner with entirely different published limits. The bag does not change between legs; the rulebook does.
| Itinerary | Leg 1 limit | Leg 2 limit | What governs |
|---|---|---|---|
| US domestic to US domestic | 22 × 14 × 9 in | 22 × 14 × 9 in | The same box throughout |
| US to London, then a UK short-haul | 22 × 14 × 9 in, no weight cap | 55 × 40 × 20 cm, 10 kg | The 20 cm depth and 10 kg cap |
| US to Europe on one carrier | 22 × 14 × 9 in | 56 × 45 × 25 cm, 23 kg | The 23 kg weight cap |
The middle row is the one that catches people, and it is a common holiday itinerary. A bag that was never weighed on the transatlantic leg meets a 10 kg cap and a 20 cm depth limit on the short one. Why that leg is the strict one.
How to find your governing limit
- List every operating carrier on the ticket, not the one you booked with. The confirmation shows “operated by” where they differ.
- Look up each one’s published carry-on box and weight cap. Ours are compiled and dated. The full table.
- Take the smallest number in each column — smallest height, smallest width, smallest depth, smallest weight. They may come from different carriers.
- That composite is your trip limit. Pack to it.
The composite is frequently tighter than any single carrier’s published box, which is worth knowing before you decide a bag is fine.
One ticket or two changes everything
The distinction that matters most on a connection, and it is not about size at all.
| One ticket (through-booked) | Two separate tickets | |
|---|---|---|
| Checked bags | Tagged through to the destination | Collected and re-checked by you |
| If leg 1 is late | The carrier rebooks you | You have missed a flight you paid for |
| Baggage allowance | Usually the through-fare rules | Each ticket's own rules, separately |
| If a bag goes missing | One carrier owns the claim | Argue about which carrier had it |
On separate tickets you also need time to leave the secure area, collect a bag, check in again and clear security a second time. An hour is not enough; people book it anyway because the fare looked good.
Why connections argue for carrying on
A checked bag on a connection has to make the same transfer you do, with less time and no ability to run. A bag that misses a connection you made is the single most common way a delayed bag happens.
Which makes a tight connection the clearest case on this site for carry-on-only — stronger even than the usual arguments about fees and carousel time. The four cases where checking still wins.
If you must check on a connection, put a tracker in the bag and one change of clothes plus all medication in the cabin. What to do when it does not arrive.
Two things that change mid-journey
- Duty-free. A sealed tamper-evident bag with the receipt inside is exempt from the liquids rule — but that exemption can be tested again at a connecting airport, and rules on it vary by country. Buy it on the last leg where you can.
- Water. Anything you filled airside has to be emptied again if you re-clear security at a connection, which happens more often than people expect on international transfers. The liquids rules.
What to buy for connecting itineraries
- Buy for the tightest limit you realistically meet, which for anyone flying Europe means 20 cm of depth and a weight cap.
- Keep the empty weight low. On a composite limit, weight is the constraint that appears from nowhere. The weight ranking.
- Prefer soft over rigid. A composite limit is usually marginal on something, and fabric survives marginal.
- On a tight connection, carry it. Whatever else this site says.
Every pick, with the working
Each entry below shows the published inputs, the four axis scores they produce, and what you give up. The order is the computed order, not a commercial one.
1 · A duffel that will actually pass a gate sizer
Eagle Creek Cargo Hauler Duffel 40L
The only 40 L duffel here whose published dimensions fit the standard 22 × 14 × 9 in carry-on box on all three sides.
- Published size
- 22 × 12.5 × 9 in
- Weight
- 1.81 lb
- Capacity
- 40 L
- Weight per liter
- 0.05 lb/L
- Cost per covered year
- $7.45/yr
- Published list price
- $149
Warranty Limited lifetime warranty
Fits 11 of 11 US carriers: AA, DL, UA, WN, AS, B6, F9, G4, HA, MX, SY. See the limits.
What it does well
- 22 × 12.5 × 9 in clears the standard carry-on box on all three dimensions as published
- 1 lb 13 oz for 40 L, and it packs into its own end pocket
- $7.45 per covered year under a limited lifetime warranty
What you give up
- No wheels and no back panel structure — the straps are a shoulder strap, not a harness
- Ballistic panels are on the base only; the body is 600D
- A soft-sided 40 L bag only holds its published shape when it is not overpacked
The arithmetic behind the score
- Value 8.0/10 — $149 ÷ 20 yr = $7.45/yr; $149 ÷ 40 L = $3.73/L
- Airline-fit breadth 10.0/10 — Fits the published carry-on limit at 11 of 11 US carriers: AA, DL, UA, WN, AS, B6, F9, G4, HA, MX, SY
- Carry efficiency 10.0/10 — 1.81 lb ÷ 40 L = 0.045 lb/L
- Warranty & support 8.0/10 — no stated end date (6 of 6); repair published (+2); airline damage not covered (+0)
Weights and breakpoints are published on how we rank. Where an input is not published, that axis is dropped and the remaining weights are re-normalized.
Specs: Eagle Creek published specifications and price, compiled 3 September 2026.
2 · One-bag travel on any carrier that measures
Osprey Farpoint 40 Travel Pack
40 L that fits the standard 22 × 14 × 9 in box on height and depth, weighs 3.27 lb, and carries a warranty with no stated end date. It is the strongest single row in this ledger.
- Published size
- 21.7 × 13.8 × 9.1 in
- Weight
- 3.27 lb
- Capacity
- 40 L
- Weight per liter
- 0.08 lb/L
- Cost per covered year
- $9.25/yr
- Published list price
- $185
Warranty All Mighty Guarantee — any reason, any product, any era
Fits 4 of 11 US carriers: WN, F9, G4, SY. See the limits.
What it does well
- 0.08 lb per liter is the best carry efficiency figure on this site
- The All Mighty Guarantee names no failure cause and no time limit
- 21.7 in height clears the 22 in standard with room to spare
What you give up
- 13.8 in width clears 14 in only when the pack is not overstuffed — soft bags grow
- No wheels, so a long terminal is carried on your back
- $9.25 per covered year is good but not the cheapest here
The arithmetic behind the score
- Value 7.2/10 — $185 ÷ 20 yr = $9.25/yr; $185 ÷ 40 L = $4.63/L
- Airline-fit breadth 3.6/10 — Fits the published carry-on limit at 4 of 11 US carriers: WN, F9, G4, SY
- Carry efficiency 8.7/10 — 3.27 lb ÷ 40 L = 0.082 lb/L
- Warranty & support 10.0/10 — no stated end date (6 of 6); repair published (+2); covers airline damage (+2)
Weights and breakpoints are published on how we rank. Where an input is not published, that axis is dropped and the remaining weights are re-normalized.
Specs: Osprey published specifications and price, compiled 3 September 2026.
3 · Anyone who wants a front laptop pocket on a hard shell
LEVEL8 Road Runner Carry-On (20 in)
Skip this one. Skip it for connecting itineraries specifically. At 9.3 lb and 9.2 in deep it is over Ryanair's 20 cm depth limit and has spent 42% of a 10 kg cap empty - so a transatlantic booking with a European short leg makes it the wrong bag on the leg that measures most strictly.
The only hard case here with a published height under 22 in, and it pays for that with the worst weight-per-liter figure in the ledger.
- Published size
- 21.5 × 14.4 × 9.2 in
- Weight
- 9.3 lb
- Capacity
- 35 L
- Weight per liter
- 0.27 lb/L
- Cost per covered year
- $9.50/yr
- Published list price
- $189.99
Warranty Lifetime warranty
Fits 4 of 11 US carriers: WN, F9, G4, SY. See the limits.
What it does well
- 21.5 in published height is genuinely under the 22 in standard
- Front-opening laptop pocket that takes a 15.6 in machine
- $9.50 per covered year against a lifetime warranty
What you give up
- 9.3 lb for 35 L is 0.27 lb per liter, more than double the Maxlite 5
- 14.4 in width is still a fifth of an inch over the 14 in standard
- The lightest thing in the bag will be the bag's own dead weight allowance
The arithmetic behind the score
- Value 6.6/10 — $189.99 ÷ 20 yr = $9.50/yr; $189.99 ÷ 35 L = $5.43/L
- Airline-fit breadth 3.6/10 — Fits the published carry-on limit at 4 of 11 US carriers: WN, F9, G4, SY
- Carry efficiency 1.4/10 — 9.3 lb ÷ 35 L = 0.266 lb/L
- Warranty & support 6.0/10 — no stated end date (6 of 6); no published repair route (+0); airline damage not covered (+0)
Weights and breakpoints are published on how we rank. Where an input is not published, that axis is dropped and the remaining weights are re-normalized.
Specs: LEVEL8 published specifications and price, compiled 3 September 2026.
4 · Hawaiian's 25 lb carry-on cap, and anyone lifting a bag overhead unaided
American Tourister Airconic Carry-On Spinner
At 4.43 lb it is the lightest hardside carry-on in this ledger by nearly a pound, which matters most on the carriers that publish a weight cap.
- Published size
- 21.7 × 15.8 × 7.9 in
- Weight
- 4.43 lb
- Capacity
- Not published
- Weight per liter
- Not published
- Cost per covered year
- Not published
- Published list price
- Not published
Warranty Limited 10 year global warranty
Fits 4 of 11 US carriers: WN, F9, G4, SY. See the limits.
What it does well
- 4.43 lb empty leaves over 20 lb of payload inside Hawaiian's 25 lb published cap
- Polypropylene flexes and returns where ABS cracks
- 7.9 in depth is the slimmest here, which is what actually decides a tight bin
What you give up
- 15.8 in width fails the 14 in limit at six US carriers
- No published price, so we cannot compute cost per covered year
- Light shells transmit more impact to what is inside them
The arithmetic behind the score
- Value not scored — No manufacturer-published price, so this axis is not scored.
- Airline-fit breadth 3.6/10 — Fits the published carry-on limit at 4 of 11 US carriers: WN, F9, G4, SY
- Carry efficiency not scored — No published capacity, so weight per liter cannot be computed.
- Warranty & support 4.0/10 — 10 yr (4 of 6); no published repair route (+0); airline damage not covered (+0)
Weights and breakpoints are published on how we rank. Where an input is not published, that axis is dropped and the remaining weights are re-normalized.
Specs: American Tourister published specifications, compiled 3 September 2026. American Tourister lists the Airconic on its own store but did not publish a price we could read on 3 September 2026, so the Value axis is not scored for this bag.
5 · Flying carriers that actually measure, and packing light on purpose
Rockland Melbourne Hardside Spinner (20 in)
The only bag in this ledger whose published dimensions clear every single US carrier's carry-on limit — because it is genuinely small.
- Published size
- 20 × 13 × 10 in
- Weight
- 7.5 lb
- Capacity
- Not published
- Weight per liter
- Not published
- Cost per covered year
- Not published
- Published list price
- Not published
Warranty 5 year limited warranty (published terms vary by retailer)
Fits 4 of 11 US carriers: WN, F9, G4, SY. See the limits.
What it does well
- 20 × 13 × 10 in clears the published carry-on limit at all eleven US carriers here
- 43 linear inches, comfortably inside Delta's 45 linear inch cap
- Expandable, so the small footprint is a floor rather than a ceiling
What you give up
- Published warranty term differs between sources, which is its own warning
- 7.5 lb for a case this small is a poor weight-per-volume trade
- ABS shell at the cheapest end of the material ladder
The arithmetic behind the score
- Value not scored — No manufacturer-published price, so this axis is not scored.
- Airline-fit breadth 3.6/10 — Fits the published carry-on limit at 4 of 11 US carriers: WN, F9, G4, SY
- Carry efficiency not scored — No published capacity, so weight per liter cannot be computed.
- Warranty & support 2.5/10 — 5 yr (2.5 of 6); no published repair route (+0); airline damage not covered (+0)
Weights and breakpoints are published on how we rank. Where an input is not published, that axis is dropped and the remaining weights are re-normalized.
Specs: Rockland published product specifications, compiled 3 September 2026. No manufacturer-published price was readable on 3 September 2026. The Value axis is not scored for this bag.
No live price is currently verified, so every button here reads Check price on Amazon rather than a number we cannot stand behind. See how we handle prices.