It's going to be a busy Labor Day weekend this year as airlines estimate 14.2 million passengers will be heading to their holiday destinations for one final break before the summer ends.

Airlines For America, an industry group, made their projection this week, according to USA Today. If you're one of the millions travelling somewhere on Labor Day, you can help reduce the chaos by simply packing efficiently. This way, you avoid delaying yourself - and other passengers in the process - at the lines.

A quick look at the Transporation Security Administration (TSA) website lets you know which items are either not allowed at airports, only allowed to be checked-in, or allowed as both a checked-in item or as a carry on. The site has specifically grouped items according to categories, but in case you missed out on some of the details, know that:

- Cash, credit cards, currencies, securities, valuables like jewelry and watches, important documents, expensive devices and irreplaceable items should never be inside your checked-in luggage. Most airline companies are not accountable for any loss or damage, according to Conde Nast.

- It's also a proven fact, airport workers steal from the baggage, according to CNN. Save yourself the headache and reconsider what valuables you must bring and keep them in your carry-on.

- Several nursing moms have had run-ins with TSA officials at the airport. It has led to altercations at the lines and even celebrities are not excused from this. The Center for Disease Control and Prevention has some recommendations for breastfeeding mothers, including storage options for breastmilk.

There are some items that you may not know are actually allowed inside carry-ons and luggage, such as alcohol in small amounts, according to Cheapflights. Check out this infographic: