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The TSA allows each passenger one quart sized clear plastic bag containing 3.4 oz or less bottles of approved liquids, aerosols and gels.
The maximum size carry-on bag for most airlines is 45 linear inches (the total of the height, width, and depth of the bag).

Carry-on Baggage | Carry-on Bag Policy | United Airlines

www.united.com/CMS/en-US/travel/Pages/BaggageCarry-On.aspx

Find carry-on baggage policy information, including size and weight requirements, liquid and gel restrictions and other guidelines for United travel.

Don't get grounded by new carry-on size limits - USA Today

www.usatoday.com/story/travel/columnist/hobica/2014/06/10/carry-on-luggage-bag-size-limits/10246511/

Jun 10, 2014 ... If you're looking for the "perfect" carry-on bag, here's some advice. ... It's interesting that not all airlines have the same size limits. Southwest and ...

Carry-On Size By Airline - Travel Made Simple

travel-made-simple.com/carry-on-size-chart/

This carry-on size chart provides the sizes allowed by each airline as well as other restrictions such as ... How to use the interactive carry-on luggage size chart.

honeymoons.about.com/od/airlinessites/qt/carry-on-bag-size-limit.htm
Carry-on bags, also known as cabin baggage and hand luggage, are subject to size and weight limits by airlines. As a general rule, most airlines' carry-on baggage rules allow for luggage that measures a total of 115 centimeters or 45 linear inches, which is the combine... More »
By Susan Breslow Sardone, About.com Guide

Carry-on luggage size requirements and rules | Alaska Airlines

www.alaskaair.com/content/travel-info/baggage/carry-on-luggage.aspx

Click here to learn about Alaska Airlines carry-on luggage size requirements and other policies.

Carryon Baggage - Southwest Airlines

www.southwest.com/html/customer-service/baggage/carryon-bags-pol.html

Southwest Airlines limits carryon bag dimensions to 10 x 16 x 24 inches. ... allowance applies to any type of stroller (umbrella, full size, jogging stroller, etc.) ... liquids in their carry-on baggage, provided they are presented in a STEB and are ...

What are the size and weight limits for bags? – Spirit Airlines Support

customersupport.spirit.com/hc/en-us/articles/202096476-What-are-the-size-and-weight-limits-for-bags-

To keep ticket prices (Bare Fare™) low for everyone, we charge for carry-ons and checked bags. We charge more for checked bags over 40 lbs. This is because ...

TSA Luggage Regulations | Carry-On Sizes and Checked Bag Fees

www.ebags.com/BuyingGuides/luggage-and-travel/TSA-Luggage-Regulations

Breeze through airport security with our TSA rules & regulations guide. This list shows what airlines allow & prohibit, carry-on info included!

Airlines could shrink carry-on bag size - Jun. 10, 2015 - CNN Money

money.cnn.com/2015/06/10/news/airlines-baggage-size-iata/

Jun 10, 2015 ... Airline trade group IATA wants carriers to reduce carry on bag sizes to make more space in lockers on board.

Popular Q&A
Q: What is the airline carry on bag size requirement?
A: The safe maximum size is 45", in the form of a 22" x 14" x 9" bag. Some airlines allow up to as much as 55", but most do Read More »
Source: www.chacha.com
Q: How airlines calculate allowable carry on bag size?
A: The linear dimension, ie total of 45 is okay. Read More »
Source: answers.yahoo.com
Q: What is the maximum carry on bag size for United Airlines.
A: Carry on bags for United Airlines should not be more than 9 x 14 x 22 in. (length x width x height) or 45 linear Read More »
Source: www.chacha.com
Helpful Resources

Carry-on baggage – Size & restrictions – American Airlines

www.aa.com

You can bring one small carry-on bag and one personal item such as a handbag or briefcase. Learn more about our carry-on guidelines and size restrictions.

Carry-on Baggage : Delta Air Lines

www.delta.com

Passengers traveling on Delta Connection flights, and only those flights with fifty ... All carry-on bags within Delta's size restrictions will be gate checked, free of ...