A backpack can be a helpful material for traveling by airplane but it should be noted that there are many different limits that can be used in terms of what type of backpack can be brought onto a plane. There are many backpack carry on rules to watch for when traveling on an airplane with a backpack. These rules deal with the number of bags that are going to be allowed for one user, the size of the bag and the maximum weight that is allowed for one of these bags.It is important to watch for the size of the backpack when getting into a plane. There may not be enough space for people to store their backpacks into overhead compartments in certain types of airplanes. This is important to know because in some cases people will prefer to put their luggage into one of these compartments instead of having it sent into the luggage compartment of the plane and picking it up later at the luggage claim section of an airport. Also, there is only so much space that can be used underneath one’s seat for storing a carry on. Using the smallest possible backpack will be important as a result.Larger backpacks that are used for weekend trips or overnight trips will generally not be able to fit in some cases. A typical area underneath the seat on an airplane will only be able to handle a material that is about five inches in height on average. As a result it will be important to watch for the size of the backpack because it may need to be stored in the luggage claim section of the plane if there is not enough space for it on the plane.It is important to know that when traveling with a backpack that only one backpack can be carried onto a plane at a time by an individual person. Different airliners will consider a backpack to be a personal item that can be carried onto a plane with ease.The weight of the backpack and the materials that are inside of it is also important. The maximum weight that can be used for most carry-ons according to average airplane carry on rules is forty pounds. It can vary for international travel though. For instance, the maximum carry on weight for Air France is only twenty-six pounds. It helps to prepare one’s backpack accordingly as a result.