Master the exact measurement priority system that determines whether your bag flies with you or gets checked.
Based on: The Secret Hierarchy of Carry‑On Sizes (what you need to pay attention to) by Aly Smalls
▶ Watch the source video on YouTube
Have you ever stood at the gate wondering if your carry-on is about to cost you an extra fee — or worse, get gate-checked right before you board? That moment of uncertainty is one of the most stressful parts of modern travel, and it happens because most travelers are working with incomplete information. They treat airline size limits like a simple pass-fail test, when the reality is far more nuanced than that.
Here's the problem: airlines publish dimensions, but those numbers don't tell the whole story. Different measurements carry different weight. The shape of your bag matters. The material matters. Whether your wheels are included in the measurement matters. And if you're comparing your suitcase to the wrong number, or measuring it the wrong way, you could be worrying about something that isn't actually a problem — or worse, confident about a bag that's going to get you in trouble at the gate.
Imagine boarding your next flight without that knot in your stomach. You know exactly which measurement to prioritize. You've measured your bag correctly — wheels, handles, zipper pulls included. You understand the real-world tolerance that experienced travelers like Aly Smalls have tested across dozens of airlines and bag sizers around the world. You know whether your soft-sided bag has a compression advantage, and you know exactly what to keep in your personal item just in case. That's not luck — that's preparation.
Aly Smalls has personally tested dozens of carry-on bags in real airline sizers across multiple countries and airlines, including Air Canada and Ryanair. She's built a database of specific bags tested against specific airline rules, and she's distilled everything she's learned into a clear, practical hierarchy that any traveler can apply. This isn't theory — it's real-world evidence from someone who has done the legwork so you don't have to.
This checklist turns Aly's video into a step-by-step action guide you can use before your next trip. It walks you through how to measure your bag correctly, how to prioritize height, width, and depth in the right order, how to evaluate whether a slightly oversized bag is likely to work, and what to do to protect yourself if you're taking a calculated risk. Whether you're shopping for a new carry-on or trying to figure out if the one you own is going to work, this checklist gives you a clear process to follow. Download it, work through it once, and board with confidence.
Every checklist item comes with actionable notes to guide you — things like "Don't forget to do this before you start," "Avoid this common mistake," or "Set a reminder for 30 days out." Nothing vague, just clear next steps.
+ 16 more action items inside...
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