When packing for a trip, many people are torn between what should go in your checked luggage, and what should travel with you on the plane. As a general rule, any valuables or breakable items should be with you at all times--jewellery, electronics, money, etc. Anything else will be better stored in your suitcase. Despite these guidelines, carry-ons can get cramped quickly, as we stuff more and more last-minute items in there, "just in case" we need them. Here are the top 10 things to place in your carry-on luggage:

1: Phone Charger

You never know what could happen between the time you get to the airport, and the time you land at your destination. It's always good to pack a phone charger with you in case your phone battery dies mid-flight. Many airplanes have charging outlets built into the seat in front of you, and there are plugs scattered throughout the airport.

2: Phone Plug Adapter

If you've remembered to pack your phone charger, that's great, but if it can't be plugged into the wall, you're out of luck! North America uses Type A and Type B plug and socket types, whereas most of Europe and South America use Type C. Make sure you purchase an adapter if you want your hair dryer, phone charger, or any other electronic to work while travelling abroad.

3: Food and Water

It's no secret that airplane food isn't exactly the best. It's a good idea to pack a light snack, or even a sandwich for your flight, especially if you've got a food allergy or sensitivity. You can't bring a bottle of water on the plane through security, but if you bring along an empty bottle and fill it up once you're past the gates, you'll be fine. The bigger bottle comes in handy if you don't like constantly asking for a cup of water when the snack cart comes along.

4: Headphones

Many airplanes offer in-flight entertainment, but some of them charge for headphones. It's a good idea to pack your own--bonus if you've got noise-cancelling headphones which make the perfect accessory for a good sleep!

5: Change of Clothes

Flying for hours takes a toll on your body, and it's always a nice feeling to change into something clean. If you're travelling to a hot country from a cold one, you don't want to be stuck wearing warm layers, and vice versa. Pack light-weight fabrics that are easy to fold, and wear shoes that complement both your in-flight outfit and your arrival outfit.

6: Neck Pillow

Unlike the window seat, where you can sometimes lay your head against the wall of the plane, the middle seat and aisle seat are challenging for sleeping positions--especially if you don't know your neighbour! A neck pillow can be very helpful if you plan on getting some shut-eye mid-flight.

photo credit: amazon.com

7: Gum

A pack of gum is great for several reasons. First, if your ears tend to pop as the plane ascends, gum can help alleviate the irritation. Secondly, if you're flying for a very long time and don't have time to quickly brush your teeth at the airport, gum will be your best friend until you do.

8: Important Documents

Your passport and a photo copy of your passport, any local and foreign currency, your health insurance, visa, and even driver's license should be with you at all times. Store it in an accessible part of your carry-on, such as a zippered pocket. Never place these items in an area that can be accessed from the outside.

9: A Pen

It's a small thing to remember, but you'd be surprised just how handy a pen can be during a flight! Prior to landing, most airlines issue declaration forms that need to be filled out prior to entering or exiting a country. Stewardesses don't have pens for everybody on board and you'll be relieved that you don't need to wait around for somebody with a pen to finish.

10: Medications

Any medications, vitamins, or supplements that you take should always be within reach. This includes pills for dietary needs, like lactose-intolerance, and ibuprofen for headaches or migraines, and antiemetics to combat symptoms of nausea that could be brought on by flying.