What Size Carry On Is Allowed

So, there I was, at the airport, ready to board my flight, when I realized I'd forgotten to check the size of my carry-on. You know that moment, right? When you're standing in line, the gate agent's giving you the stink eye, and you're praying to the travel gods that your bag isn't too big?

Well, let me tell you, I was in for a rude awakening. My bag was not only too big, but it was also heavier than a small child (not that I've ever tried to weigh a small child, but you get the picture). I ended up having to check it in, and you know what that means - goodbye to my carefully packed liquids, hello to the great unknown of checked baggage handling.

But enough about my travel woes. Let's talk about carry-on sizes, shall we? Because, my friend, I don't want you to end up in the same situation. So, grab a coffee (or a tea, if you're that way inclined), get comfortable, and let's dive into the wonderful world of carry-on allowances.

Size Matters

First things first, what exactly are we talking about when we say 'carry-on'? Well, it's that bag you bring on the plane with you, filled with all your essentials - your laptop, your snacks, your in-flight entertainment (yes, I'm talking about those celebrity magazines).

Now, here's where it gets interesting. The size of your carry-on can vary depending on where you're flying. Yes, you heard me right. It's not a one-size-fits-all situation. It's more like a 'one-size-fits-most, but not always, so you'd better check' situation.

Domestic Flights in the US

Let's start with domestic flights in the US. The general rule of thumb is that your carry-on should be no larger than 22" x 14" x 9" (that's 56cm x 36cm x 23cm for our metric friends). But, and this is a big but, some airlines have their own rules. For instance, Spirit Airlines has a smaller allowance - just 18" x 14" x 8" (46cm x 36cm x 20cm). So, always double-check with your airline.

And what about weight? Well, most airlines don't have a weight limit for carry-ons, but they do have a size limit. So, you can pack as much as you can fit (within reason, of course. I don't want to see anyone trying to stuff a small refrigerator into the overhead bin).

International Flights

Now, let's talk about international flights. The size allowance can vary even more here. For example, if you're flying with British Airways, your carry-on can be up to 21.7" x 15.7" x 9.8" (55cm x 40cm x 25cm). But if you're flying with Ryanair, it's much smaller - just 21.6" x 15.7" x 7.8" (55cm x 40cm x 20cm). So, again, always check with your airline.

American Airlines Carry-On Size & Baggage Rules (2026) - Carry-On Size

As for weight, some airlines do have weight limits for carry-ons. For instance, on Ryanair, your carry-on can't weigh more than 10kg (22lbs). So, you might want to rethink packing your entire wardrobe for that weekend getaway.

What Happens if Your Bag is Too Big?

So, what happens if your bag is too big? Well, it's not pretty. You'll either have to check it in (and pay the checked baggage fee, if there is one) or gate check it (which means it'll be taken from you at the gate and put in the hold). Either way, you're going to have to say goodbye to your bag for a little while.

And let's not forget about the stress. The last thing you want when you're trying to relax and enjoy your flight is to be worrying about your bag. Trust me, I've been there, and it's not fun.

Tips for Packing Your Carry-On

So, how can you avoid all this drama? Here are a few tips:

• Measure your bag before you go to the airport. It's not enough to just guess. You need to know for sure that your bag is the right size.
• Weigh your bag if your airline has a weight limit. You don't want to be caught off guard at the gate.
• Pack smart. Roll your clothes instead of folding them. It saves space and reduces wrinkles. And don't be afraid to use packing cubes - they're a game-changer.
• Check your airline's rules before you pack. Every airline is different, so it's important to know what you're dealing with.

And there you have it, folks. The lowdown on carry-on sizes. I hope this helps you avoid any airport drama on your next trip. Happy travels!