Backpack size is an important consideration when planning a trip. Small backpacks are lightweight, but may lack the space you need for all your essentials, or unforeseen surprises. A larger backpack, however, comes with a heavier weight, bulkier size, and may have more room than you actually need. And in the case of oversized backpacks, they may outright exceed carry-on backpack size restrictions, forcing you to have to check what should have been a personal item.
The right backpack for you depends on how you travel, how long you’ll be away, and what you need to pack. You’ll want a backpack that’s comfortable to carry as you navigate through airports, meets airlines’ carry-on backpack dimensions, and has enough room for clothing, toiletries, electronics, and maybe a souvenir or two.
Is a Backpack Considered a Carry-On?
Is a backpack considered a carry-on or personal item? If you can fit it comfortably under the seat in front of you, it’s considered a personal item. Larger backpacks that fit into the overhead bin are considered carry-on. Depending on the airline, you may have some wiggle room here: a backpack might be considered a personal item when only half full, but a carry-on when fully packed.
Understanding Carry-On Backpack Size Requirements
Standard Carry-On Backpack Dimensions
The standard carry-on backpack size for most U.S. domestic airlines is 22 x 14 x 9 inches. The dimensions include the wheels and handles, and the bag must fit into the overhead bin. The Travelpro® Altitude™ Convertible Duffel/Backpack fits these dimensions with room to spare, and can expand to an impressive 56 liters (like backpacks, you can use a duffel bag as carry-on if the bag meets the airline’s size restrictions).
Carry-on backpack dimensions for international flights vary, but are typically around 21.5" x 13.5" x 7.5" / 9.5". The Platinum® Elite Slim Laptop Backpack is an excellent choice for international travel, as its dimensions fall well within airline size requirements.
Always check your airline's carry-on backpack size policy, as it varies by airline. Most carriers don't have weight restrictions on backpack weight, while others limit carry-on weight to 22 lbs.
Personal Item vs. Carry-On Backpack
Personal items include any bag, purse, or tote that can fit under an airline seat. Many smaller laptop backpacks, such as the Altitude™ Slim Expandable Laptop Backpack, fit under airline seats with room to spare. As a general rule, any bag that measures 18” x 14” x 8” works well as a personal item.
Choosing the Right Backpack Size for Your Trip
Weekend Trips (1–3 Days)
For a weekend trip, choose a backpack with a volume of 25 to 35 liters, which allows you room for a couple of changes of clothing and your electronics. The multi-compartment Platinum® Elite Business Laptop Backpack makes a great overnight bag, while the larger Altitude™ All-Purpose Full Expansion Laptop Backpack is a better choice for 3-4 day travel.
Week-Long Travel
For a roughly weeklong trip, you have two choices if you don't want to check luggage. First is a backpack with a volume of 30-45 liters, which is generally the largest you can bring as carry-on (for budget or international airlines, you're safer with a 30-35 liter bag). Your other option is to use a smaller carry-on backpack with a personal item, such as a slim backpack or tote bag.
Choosing the Right Carry-On Backpack for Your Travel Style
The right carry-on backpack for you depends not only on what you pack, but also on how you prefer to travel. If you're a fan of staying agile and traveling light, and don't plan to bring back more than you left with, a slim backpack may be all you need. If you prefer to shop at your destination, opt for a larger backpack or one with an expandable section to bring back souvenirs and gifts.
Looking for a backpack that meets airline size requirements while maximizing packing space? Discover Travelpro® backpacks designed for modern travelers.