The Bag Sets the Limit
A 40-liter bag holds enough for weeks and still slips under most carry-on limits. That is the whole trick. The pack size sets the ceiling on how much you bring, so go smaller than you feel comfortable with. If you leave room, you fill it.
The Tortuga Expandable Backpack has enough capacity for one-bag travel at its baseline. Open the expansion zipper and you get an extra 5.5 liters. It is a bit too large to pass as a daypack. The compressible profile does help with carry-on compliance, which is the point.
Then there is the French option. A 40L model that passes as cabin baggage on most low-cost flights, built for travellers who know how to settle for the essentials. One of the better value-for-money packs on the market. Its price: $75.59.
Low-Fare Airlines Charge for Everything
There is no such thing as an almost-free lunch. Low-fare airlines make their money through extortionate extra fees. Everything costs, from meals onboard to printing your boarding pass at the airport. Checked baggage can cost $30 or more, and some charge extra for big cabin luggage as well.
Keep in mind that you will have to pay to check your baggage on these cheap flights. It costs about $27 to $42 for one checked bag. Wait until the gate to pay for that luggage and you end up paying almost double. Carry-on only avoids the added cost entirely.
Volaris is a no-thrills, low-cost airline. You can bring two carry-on items, one carry-on and one personal, onboard for free. Avoid baggage fees by making sure your luggage does not weigh more than 15 pounds. They will check.
What Carry-On Only Avoids
One carry-on. No checked bag fees at $30 to $60 each way. No waiting at baggage claim. No lost luggage stress.
Run the arithmetic on a return trip with one checked bag at $27 to $42 each direction. That is $54 to $84 gone before you have left the airport. Pay the gate rate and the same bag costs close to double. On a two-week trip that money is a bed for several nights, or most of a bus ticket across a country.
The 15-pound limit on Volaris is worth treating as a real constraint rather than a suggestion. A 40-liter pack at its baseline weight, filled properly, can sit under that. Fill it because there is space and it will not.
Buses Do Not Play These Games
Flixbus is usually the cheapest bus option, with prices starting as low as $5.40. Their buses include Wi-Fi, electrical outlets, free baggage — one carry-on and one stored under the bus — and comfy seats. Megabus still runs in the UK.
Compare that with the airline bag fee. The bus gives you a second bag under the floor for nothing. The airline charges $30 or more for the same bag, and you have to stand at a carousel to get it back.
That gap explains why a carry-on-only traveller ends up on more buses than they planned. The bag rule and the transport choice are the same decision. A pack that fits the cabin keeps the cheap bus cheap, keeps the low-cost flight free of fees, and keeps you moving through the station rather than waiting at the belt.
The Size You Pick
Pick the pack before you pick the flight. A 40-liter bag is the practical ceiling for most carry-on limits. The Tortuga expansion adds 5.5 liters when you need it and compresses back when you do not. The French 40L at $75.59 does the same job for less money.
Then weigh it. Fifteen pounds is the number that matters on Volaris. Everything else on a low-cost carrier is a fee waiting to happen, from the boarding pass printout to the meal to the cabin bag that turns out to be too big.
One carry-on, weighed and within the limit, is the version of this that costs nothing extra. That is the entire argument.
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