Usually, many airlines won't check every carry-on but will instead go for ones that look oversized. If your luggage does not fit in the sizer, you might have to pay a checked bag fee along with the gate checking fee and have your bag transferred to the airplane's cargo.
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While personal item size restrictions vary across airlines, most airlines consider a small backpack, purse, briefcase, or laptop bag to be a personal item. These must always fit under the seat in front of you. Many airlines restrict passengers to one personal item and one carry on bag.
The question about whether something—anything—can be a “personal item” comes down not to what it's called, then, but whether it will fit under the seat in front of you. So, yes, if your backpack is small enough that you can fit it under the seat in front of you, then it's a personal item.
In general, travelers are permitted to bring into the plane one personal item and one carry-on bag with them on most flights. The personal item is often a small bag, such as a handbag or laptop bag, that is able to be stowed away beneath the seat that is directly in front of you.
If your bag is too large and it isn't flexible, you won't be able to fit it inside. But airlines rarely ask you to use it. What is this? Unless your carry-on is extremely large, the airline employees at the gate most likely won't ask to measure it.
In most cases, backpacks are considered personal items as long as they fit under the seat in front of you. For example, if you use a backpack as a personal item and put it under the seat in front of you, you can then use a duffel as a carry-on bag as long as it's under the airline's size requirements.
The only time this might be worth the risk is if your personal item is only an inch or so bigger than that of the limits stated, and is soft-sided. At least if it's only slightly bigger, you should still be able to pad it down and demonstrate it fits in the sizer if required to.
The main reason they don't scrutinize weight for carry-on bags is that they don't need to. Per Skift: When engineers design a plane, they make intricate calculations about the weight of passengers and the bags that they may bring on board….
Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.
A good rule of thumb is that if your carry-on bag fits under the seat in front of you, it's considered a personal item. This includes small backpacks, purses, briefcases, laptop bags, etc. Larger bags, including suitcases, must fit in the overhead bin compartment.
Luckily, Tortuga makes backpacks that work as underseat carry ons. 30L or 40L backpacks are great options for primary carry ons but are usually too big to be considered personal item that need to be small enough to slide easily under the seat in front of you.
If your carry-on is oversized (and doesn't physically fit inside the overhead compartments) or you encounter a strict airline employee, they will ask you to check it in at the gate.
What if my cabin bag is 2cm bigger? Extra 2–4 cm wont be noticed by the check in staff and they dont have a ruler to measure the dimension. they only strict with the weight. But extra 2–3 kg is also not a problem.
Most airlines let you bring a carry-on bag and a personal item. In most cases, your handbag, briefcase, or small backpack must fit beneath the seat in front of you and within the airline's size restrictions. In contrast, a carry-on bag is typically larger and is stored in the overhead compartment.