Carefully packing your carry-on bag before your flight on Frontier Airlines allows you to have immediate access to whatever books, magazines and snacks you wish to enjoy on your flight. Of course, you won't have these conveniences if you don't make sure your carry-on bag meets the airline's baggage size regulations. Upon booking your Frontier flight, get out your measuring tape to ensure your bag is the appropriate size.

A Matter of Inches

When you fly with Frontier Airlines, you're allowed to board the plane with one carry-on bag. The bag must weigh no more than 35 pounds and its maximum external size cannot exceed 10 by 16 by 24 inches. If the piece of luggage you wish to use as your carry-on bag does not meet Frontier's guidelines, you must pay to check the bag. The fee depends on your ticket level.

Other Items You Can Carry

Commercial airlines typically allow you to travel with one or more personal items beyond the piece of luggage you consider your carry-on bag, and Frontier is no exception. Frontier travelers can carry one personal item, such as a purse, handbag or briefcase, provided it doesn't exceed 18 by 14 by 8 inches. Additional items, such as coats, diaper bags and assistive devices, are also allowed.

Keep Your Liquids Small

Packing your carry-on bag correctly can be a hassle if you aren't familiar with the Transportation Security Administration's regulations concerning prohibited items. When packing a liquid substance, the bottle should have a volume of no more than 3.4 ounces. Make sure the bottle is tightly sealed and then pack it in a clear zip-top plastic bag to allow the TSA inspector to view it quickly at the security checkpoint.

Checked Bags Have Guidelines, Too

When preparing your checked baggage in advance of your trip on Frontier Airlines, it must measure a maximum of 62 linear inches. To obtain this measurement, measure each side of the bag and add the dimensions together. Checked baggage must also weigh no more than 50 pounds. As of November 2013, you're subject to a $75 fee if your bag exceeds either the size or weight regulation. The prices for checked bags vary considerably, depending on your ticket level. Your first checked bag is free unless you booked a basic or economy fare, but subsequent checked items can incur a fee.