Carry On Backpack Size Guide: How to Choose the Right Fit

Carry-on backpack on the floor

Through countless new journeys, I’ve come to realize a simple yet crucial truth: choosing the right carry on backpack size can make traveling far more enjoyable.

I remember last winter at the airport security checkpoint, my carry on backpack was slightly over the size limit, and I was hit with extra baggage fees. That moment made it crystal clear how important it is to understand and adhere to each airline’s carry on backpack size regulations. Since then, I’ve delved deep into researching how to meticulously select a backpack size that meets my travel needs and complies with airline policies, ensuring my trips are hassle-free.

In this blog post, I’m going to share the insights I’ve gained to help you find the perfect carry on backpack that matches your travel style, making every trip an easy adventure.

carry on backpack

I. What Size Carry On Backpack Should I Purchase?

When gearing up for travel, one of the most common questions travelers ask is: “What size carry on backpack should I purchase?” The answer isn’t one-size-fits-all; it depends on various factors, including airline regulations, the length of your trip, and the items you need to carry.

Airlines typically have standard size restrictions for carry-on luggage, usually not exceeding 45 total linear inches (length + width + height), specifically 22 inches long, 14 inches wide, and 9 inches high. To ensure a smooth boarding process, be sure to choose a backpack that fits within these size restrictions. However, since airline regulations can vary, always double-check the baggage policy of the airline you’re flying with.

Before you set out, it’s crucial to visit the airline’s official website to check the most up-to-date carry-on luggage size and weight restrictions. Especially with budget airlines, their requirements for luggage size and weight tend to be more stringent. In such cases, opting for a backpack around 35 liters might be more appropriate. Also, don’t be misled by products on the market labeled “suitable for carry-on”; always check the product specifications to ensure they truly comply with airline standards.

Different Types of Backpacks

II. Choosing the Right Size Backpack for Your Travel Needs

When selecting the ideal carry-on backpack size, considering the length and purpose of your trip is key. The right backpack should not only fit airline regulations but also comfortably and conveniently accommodate your belongings.

Who should choose a large carry-on backpack (35-45 liters):

Suitable for: Travelers on long journeys or those needing extra space for gear.

If you’re planning a trip lasting more than a few days and need to pack additional items like shoes, bulky clothing, or tech gadgets, you should opt for a larger carry-on backpack. Bags like the Osprey Fairview 40 and Cotopaxi Allpa 35L are examples of such bags favored for their spacious compartments and organizational features. However, be mindful of airline size restrictions, typically capped at 22 inches x 14 inches x 9 inches or an overall 45 linear inches, to ensure your choice complies and avoids any check-in issues.

Who should choose a large carry-on backpack (35-45 liters):

Suitable for: Weekend getaways, business travelers, and minimalists.

If you’re a light packer or on a weekend trip, go for a medium-sized backpack. Backpacks like the Asenlin 40L Travel Backpack and Vancropak 40L Travel Backpack provide ample space for essentials while maintaining manageable dimensions for navigating airports, making them a strategic choice for fast-paced travel. Their compact nature also means they’re more likely to fit in most overhead bins and under the seat in front of you.

Who should choose a large carry-on backpack (35-45 liters):

Suitable for: Daily commuting, short excursions, or those who only need to carry essentials.

If your trip is limited to a day or two, or if you prefer to carry only your phone, wallet, passport, and a few personal items, then a small carry-on backpack is the way to go. Backpacks like the Incase City Compact Backpack and Herschel Little America Mid-Volume are designed to be sleek, lightweight, and easy to carry, while still providing enough storage space to meet your most basic travel needs. These backpack sizes are typically suitable for fitting under the seat of any airline, making your travel much more relaxed and comfortable.

III. Tips for Quickly Passing Through Security

Navigating airport security can be one of the most stressful parts of traveling. To ensure a quick and smooth experience, it’s essential to prepare and carefully select your gear. Here are some tips that can help you pass through security checks quickly:

Choose Backpacks with Security-Friendly Features

  • Selecting a backpack with security-friendly features can make a significant difference in how quickly you can move through the security line. Look for backpacks that offer:
  • Laptop Compartments: A separate and easily accessible laptop compartment allows you to quickly remove your device without having to rummage through your entire bag.
  • Organized Pockets: Pockets designed for travel essentials like your boarding pass, ID, and travel-sized liquids can speed up the process as everything is in one easy-to-reach place.
  • Compliance with TSA Guidelines: Ensure your backpack complies with TSA guidelines for carry-on luggage. This includes adhering to the size and liquid restrictions, as well as being able to lay flat on the conveyor belt if necessary.

By choosing a backpack with these features, you can reduce the time spent at security checkpoints and make your overall travel experience more pleasant.

Transparent Backpacks Can Be a Great Option

Transparent backpacks are becoming increasingly popular, especially for travelers looking to expedite the security process. Here’s why they might be a good choice:

  • Visibility: With a transparent backpack, security personnel can easily see the contents of your bag without opening it, which can speed up the screening process.
  • Convenience: Packing and finding your items is straightforward when you can see everything at a glance.
  • Compliance: Transparent backpacks are usually designed to comply with security regulations, making them less likely to be flagged for manual checks.

However, it’s important to consider the downsides as well:

  • Privacy: Your belongings are visible to everyone, which might not be comfortable for all travelers.
  • Durability: Transparent materials can vary in durability. Make sure to choose a backpack made from sturdy materials that can withstand the rigors of travel.

Whether choosing a traditional or a transparent backpack, the key is to stay organized and adhere to the TSA guidelines and your airline’s regulations. This will help ensure that you pass through security as quickly and smoothly as possible, getting you one step closer to your destination.

carry on backpack size guide

IV. Popular Backpack Models Recommended

Small carry-on backpacks (10-15 liters):

1. The North Face Electra Backpack: This stylishly designed backpack is perfect for travelers who don’t want to sacrifice functionality for style. The women-specific fit features ergonomic shoulder straps and a breathable back panel for comfortable wear. The Electra’s multiple built-in pockets keep your small items organized, while the top handle makes for quick and easy carrying.

2. Deuter Speed Lite 12: Born for those who seek ultimate lightness in their outdoor adventures, the Deuter Speed Lite 12 offers unmatched comfort and freedom. Its ultra-light structure and compact design make this backpack ideal for short hikes or daily urban commutes. Internal dividers in the backpack make organizing items more convenient, and the side zip pockets can hold a water bottle or umbrella.

3. Patagonia Atom Sling 8L: This single-strap backpack has a unique design that allows you to easily swing it to the front for access. Its interior is simple but spacious enough to hold your tablet, journal, and other small items. External compression straps adjust the size of the backpack to accommodate your daily carry items.

Medium carry-on backpacks (15-30 liters):

1. Osprey Daylite Plus Daypack: This backpack is not only suitable for daily commutes but also a great companion for outdoor activities. The Daylite Plus’s main compartment is spacious enough to hold your lunch box, jacket, and books, while the front zip pocket and side mesh pockets make accessing small items convenient. Its lightweight design and ventilated back system ensure comfort over long periods of wear.

2. Thule Subterra Backpack 23L: Designed for business travel, this backpack has dedicated laptop and tablet compartments, along with essential organizational pockets. The Thule Subterra’s streamlined and stylish design makes it an ideal choice for urban commuters. Its SafeZone compartment also provides extra protection for safely storing glasses or electronics.

3. Pacsafe Venturesafe X30 Anti-Theft Adventure Backpack: Combining security with functionality, this backpack is equipped with innovative anti-theft technology, such as RFID-blocking pockets and lockable zippers. Its spacious main compartment and multiple external pockets make organizing and separating your travel items simple. Additionally, the backpack’s structure also takes into account comfort while carrying, ensuring comfort even on long journeys.

Large carry-on backpacks (35-45 liters):

1. Osprey Farpoint 40 Travel Backpack: This backpack is the perfect companion for travelers, whether for urban exploration or wilderness trekking. The Farpoint 40 is designed to carry weight efficiently while offering multiple access points for easy packing and retrieval. Adjustable straps and hip belts ensure a proper fit for travelers of all body types.

2. Tortuga Setout Backpack: The Tortuga Setout combines urban style with travel functionality. Its laptop compartment, clothing organization system, and multiple pockets keep your belongings well-organized. Moreover, the size of the backpack complies with the carry-on luggage size requirements of most major airlines, allowing you to breeze through airports.

3.Gregory Mountain Products Zulu 40 Liter Men’s Backpack: The Gregory Zulu 40 is designed for travelers seeking adventure. Its FreeFloat suspension system provides excellent ventilation and comfort, while the multiple access points to the main compartment and large front zip pocket make managing gear easy. Whether it’s for a multi-day hike or international travel, the Zulu 40 is a sturdy and reliable choice.

V. Frequently Asked Questions

1. What is standard carry-on luggage size?
The typical size for carry-on luggage for most airlines is 22 inches by 14 inches by 9 inches. This includes handles and wheels, and it’s essential to adhere to these dimensions to fit in the overhead bin.

2. What is the best size for carry-on luggage?
The best size for carry-on luggage ensures a fit within the overhead compartment and complies with the most common size limits of airlines. A size of 21 inches by 13 inches by 8 inches is universally accepted by many airlines and provides ample space for essentials.

3. How does TSA regulate the size of liquids in a carry-on backpack?
TSA mandates that all liquids in carry-on bags must be in containers of 3.4 ounces (100 milliliters) or less and must be stored in a single, clear, quart-sized zip-top bag. You’re allowed one such bag per passenger.

4. Is it possible for a backpack larger than 35 liters to fit under an airplane seat?
Backpacks larger than 35 liters may struggle to fit under an airplane seat, as space is typically limited. You should check with your specific airline for their under-seat dimensions but prepare for restrictions closer to 18 inches by 14 inches by 8 inches.

5. Are there specific carry-on backpack size requirements for American Airlines?
Yes, American Airlines specifies that carry-on bags, including handle and wheels, must not exceed 22 inches by 14 inches by 9 inches to fit in the overhead bin or 18 inches by 14 inches by 8 inches to fit under the seat in front of you.

6. What is the maximum size for a backpack to be considered a carry-on item rather than checked baggage?
To be considered carry-on rather than checked baggage, a backpack must typically not exceed 22 inches by 14 inches by 9 inches. Though, this can vary slightly by airline, so it’s advisable to check with your airline before travel.

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