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.
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Carry-on items stored overhead must be 24 by 16 by 10 inches. Personal items for under the seat – including purses, briefcases, cameras, food containers, laptops and backpacks – cannot be larger than 16 1/4 by 13 1/2 by 8 inches.
The short answer: Yes, a backpack is generally considered a personal item if it fits under the seat in front of you. Most airlines offer a few examples of things that fit into the “personal item” category, such as a purse, laptop bag, or a briefcase, but they don't usually include “backpack” on those lists.
Dimensions for carry-ons vary by airline, but a good rule of thumb is that any backpack less than 45 liters should fit most airlines (but be careful with ultra-budget airlines — especially in Europe). Any bigger than that, and you risk extra charges.
Typically, the bag must be within the cabin baggage dimensions of around 22 x 14 x 9 inches (56 x 36 x 22 cm), commonly considered the standard size for carry-on. Any bag within this dimension can fit most aeroplanes' overhead compartments.
Their dimensions also often fall under the maximum carry on requirements for peace of mind when traveling light. We recommend using a 30 liter backpack carry on as its often just the right size for airline bag requirements.
As a general rule of thumb, anything smaller than the dimensions of a carry-on can be considered a personal item. However, every airline has different restrictions for size. In most cases, your backpack should be no more than 18 x 14 x 8 inches.
The 40L will max out carry on dimensions on most airlines so you never have to check a bag. For stricter airlines, like RyanAir, 30L will be a better choice.
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.
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.
Delta Personal Item SizeDelta underseat dimensions are 20 inches X 15 inches X 11 inches (55 cm X 38 cm X 28 cm) on most aircraft. To ensure your personal item fits these dimensions, choose an item that is 17 inches X 13 inches X 9 inches (43 cm X 33 cm X 23 cm) or smaller.
Your personal item like a purse or small handbag must fit under the seat in front of you. Dimensions should not exceed 18 x 14 x 8 inches (45 x 35 x 20 cm).
While this can be confusing, most popular airlines allow you to bring a carry-on and personal item, such as a backpack or purse. In general, your personal item should be smaller than your carry-on and under the specific airline's carry-on dimensions, allowing it to fit under the seat in front of you.
A personal item is any small bag that fits beneath the seat in front of you. Possible personal items include purses, laptop bags, camera bags, totes, diaper bags, and small backpacks.
Carry-ons are measured at the airport before boarding the plane. It's done with metal measuring boxes just in the right size for the allowed carry-on dimensions. 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.
TSA Guidelines for Checkpoint Friendly BagsIn a nutshell, the current requirements are as follows: Your laptop bag has a designated laptop-only section that you can lay flat on the X-ray belt. There are no metal snaps, zippers, or buckles inside, underneath, or on top of the laptop-only section.
I recommend a backpack around 40L-50L. Personally, I wouldn't go over 65L, but some people like a bigger bag. You can always go smaller, but I wouldn't recommend anything smaller than 35L — unless you're into minimalist travel.
However, every airline has different restrictions for size. In most cases, your backpack should be no more than 18 x 14 x 8 inches. You should confirm with the airline to avoid penalty fees if your personal item is too large.
Generally, you're allowed one carry on and one personal item, such as a purse, suit bag, briefcase. As long as your backpacks conform to the airline size specifications for hand luggage, it's not a problem that both your carry-ons are backpacks.