Porter Airlines Carry-on Size

Porter Airlines carry-on size tops out at 21.5 x 15.5 x 9 inches, or 55 x 40 x 23 cm. Wheels and handle are included in that number, and Porter publishes no weight limit for cabin bags. That box beats what most US carriers allow, but Porter still leaves the carry-on off its cheapest fare.

Knowing the Porter Airlines carry-on size rule before booking the Basic fare saves a gate surprise later.

What actually fits in the sizing units

Porter states its carry-on limit as 21.5 x 15.5 x 9 inches, or 55 x 40 x 23 cm. That figure already includes wheels and the extended handle. The airline sets no separate weight cap for cabin bags, only the size box.

Every bag has to clear Porter’s sizing units. They sit at check-in and again at the gate. A bag that slips past the counter can still get pulled later.

The 21.5 inch height is a bit more forgiving than the 22 x 14 x 9 box most US airlines use. The 15.5 inch width also gives a boxy hardside more room. That size still trips up bags built for the tighter European limits.

How Porter checks it and what a failed bag costs

If a bag does not fit Porter’s sizing unit, the airline checks it at the gate for a fee. It does not send you back to repack. Porter also reserves the right to gate check any bag it cannot safely stow, sizer or no sizer.

The cheaper fix is to catch an oversize bag at the counter. Airport check-in pricing for an oversize or overweight cabin bag runs lower than the same fix at the gate. Porter’s fee brackets rise with each bag and with the route, and international departures cost more than domestic ones.

Anyone who has read Porter’s baggage fees page already knows the pattern. Paying online ahead of time is always the cheapest option. The gate is always the most expensive place to fix a bag problem.

Which fares actually include a carry-on

This is where the Porter Airlines carry-on size allowance confuses new flyers. Basic fare passengers get a personal item only. The standard carry-on bag is not included at any size on Basic.

Standard, Flexible, Freedom, Navigate and Ultimate fares all include the full carry-on plus the personal item. Freedom and Flexible add one free checked bag on top of that. Navigate and Ultimate add two.

A Basic fare flyer who shows up with a full size roller bag has two options. They pay to add it during booking, or they get charged at the airport. The site covers the same trap for other airlines on its basic economy carry-on guide.

The personal item and what happens at the gate

Porter’s personal item box is 13 x 17 x 6 inches, or 33 x 43 x 16 cm. It is included on every fare, Basic included. Porter lists briefcases, purses, small backpacks, camera bags, laptop computers and small garment bags as acceptable personal items.

Bring anything larger and Porter counts it as a second item. On a Basic fare, a second item has nowhere free to go. Readers who mix up the two boxes should see the site’s personal item versus carry-on guide before they pack.

A bag that clears the personal item box but not the carry-on box still gets gate checked. The fee applies either way.

Carry-on bags that fit Porter’s box

Porter’s 21.5 x 15.5 x 9 inch box is roomier than the typical US airline limit. Several popular carry-ons clear it with room to spare. At least one popular size does not.

The Samsonite Omni PC 20 inch hardside spinner is built around the tighter 22 x 14 x 9 US box. It sits well inside Porter’s larger dimensions on every side. The Delsey Paris Helium Aero 19 inch international carry-on is smaller still, built for European cabin limits, and clears Porter’s box with margin to spare.

The Travelpro Maxlite 5 21 inch softside carry-on spinner is a different story. Travelpro’s own spec sheet lists its overall size, wheels and handle included, at 23 x 14.5 x 9 inches. That is taller than Porter’s 21.5 inch limit even before the bag is expanded.

The Wrangler Smart Spinner 22 inch carry-on with cup holder runs into the same problem. It is sold at the top of the US 22 inch class, which means it runs longer than Porter’s 21.5 inch cap.

Use the site’s size checker against Porter’s exact numbers before buying or packing a bag. Anyone who wants the general method should read how to measure carry-on luggage with wheels and handle included. That is the number Porter’s sizing units actually check.

Porter versus its Canadian rivals

Porter’s carry-on box beats Air Canada’s carry-on size allowance on height. It also comes in a shade more generous than WestJet’s carry-on size limit. The gap that matters more than the box is the fare.

Porter’s Basic fare drops the carry-on entirely. Air Canada and WestJet do not treat their cheapest fares the same way. Anyone booking Porter’s lowest fare should plan around the personal item alone, or add a carry-on at checkout.

Porter publishes the sizing units and fare inclusions on its own carry-on allowance page, which is the source for every figure above.

The bottom line

The Porter Airlines carry-on size limit is 21.5 x 15.5 x 9 inches with no weight cap. That makes it one of the more generous cabin boxes among North American airlines. The catch is fare, not size.

Basic fare passengers do not get a free carry-on at all, only the personal item. Measure with wheels and handle included. Watch for bags built to the taller US 22 inch class, and prepay online if a bag might run over.

Some links on this page are Amazon affiliate links. If you buy through one, Carry On Sizes may earn a commission at no extra cost to you. It never changes what we recommend. How this works.