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If you are flying within your country, this is not likely too important. But if you are flying to another country, you will want to make sure you have the address and phone number of your destination. For this reason, it is always good to have your first nights accommodation booked if you are not sure where all you are going. It makes going through customs a heck of a lot easier!
These days, there are limits to what you are allowed to bring on the plane with you. Liquids is a pretty big one with restrictions on anything that is more than 3 ounces. Those have to go into your checked luggage. If you aren't checking anything, then leave these items at home and buy them at your destination. If you try to take them on, they are just going to make you toss them out at security.
Be aware of what size of luggage you are allowed to bring on the plane with you. Depending on the size of the plane, you may have to gate check any carry-on bags you have. Checked luggage usually doesn't have too many restrictions in regards to size but there are limits to how heavy the bags can be. Typically it is 50 pounds but it is always best to check with the airline that you are flying with.
Again, if you are flying out of your country there are limits to how much you can bring back from other countries. If you have left Canada, you can bring up to $800 worth of product back to the country if you were gone for 48 hours or longer. You can also bring a certain amount of alcohol and tobacco back duty free which goes against the $800. It is always best to check the limits when you travel as they can change and every country is different.