How Big Is A 40 Liter Backpack (Helpful Guide)

40l backpack size

There are so many different sizes of the backpack available due to which it becomes more important to know how big is a 40 Liter backpack and what you can keep in it and how you can use it.

This is why, in this article, we are going to know about the size, weight, and other important things about a 40-liter backpack.

We will also see why (or why not) a 40-liter backpack can be ideal for you.

So, let’s get started!


How Big is a 40 Liter Backpack Size?

20.5 x 13 x 7.1 inches is the dimensions of backpack whose capacity is 40 liters which is equal to the 2440.95 cubic inches of the storage capacity. The 40-liter backpack is generally a middle-sized hiking backpack that weighs between 1.9 Pounds to 3 pounds.

Now, before we move forward it is important to know why backpacks are measured in liters and how the storage capacity of the backpack is determined.

There are two main factors that determine the capacity of the backpack and these are:

  • Dimensions of the 40 liter backpack
  • The volume of the 40 Liter backpack

The dimension of the backpack tells us about the size of the backpack while the volume of the backpack tells us the capacity of the backpack.

The volume of a backpack also depends on the number of pockets and mesh provided in it.

So, you must look for both things while making a purchase. If you want to know more about this then you must read our article on “How to Measure a Backpack“.

backpack 40l capacity
backpack 40l capacity
40l backpack size
40l backpack size
how big is a 40l bag
how big is a 40l bag

40 Liter Backpack Size and Dimensions:

20.5 x 13 x 7.1 inches is the average dimension of a 40 Liter backpack which can store the gears of 2440.95 cubic inches of volume. The dimension of the backpack is measured using measuring tapes or a ruler.

To understand the capacity of the 40l backpack you must understand how it is measured.

So, first, the dimensions of each compartment are measured internally in cubic inches and then they are multiplied together.

This gives us the volume of each compartment and then the volume of each compartment is sum up together and converted into liters.

This way we get the volume of the backpack and even there is another way of measuring the volume which is more accurate and for this, you should read our “How To Measure Backpack Volume” article.

Why 40 Liter Backpack Is Ideal For You?

While I was researching about 40-liter backpacks I came to know that the backpacks that fall in the range of 35 to 55 liter are good for hiking and traveling.

This is why a 40-liter backpack can be ideal for you if you want to carry a lot of gear with you comfortably.

The backpack that has more than a 60-liter capacity can be quite large which can help you if you are overpacking or you need a lot of gear for your hike.

You can carry all your stuff easily and perfectly in it. Some of the hiking backpacks have bungee cords available that you can use for various purposes.

If you are not familiar with the bungee cord then here is the guide about how to use the bungee cord on a backpack.

In some airlines, the airlines require to check most of the backpacks that are above 45 liters because not all the backpack sizes are airline approved and now if you want to know how many liters is a carry on bag then here is an informative guide for you.

So, to avoid all this you should buy a 40 Liter backpack is the great choice for you because based on the size of the backpack 40 liters is a good size for hiking as well as for daily use.

You can manage your stuff and items and it will not be too large to manage and carry.

You can put most of the essentials in it and enjoy your trip.

Things to Consider for40 liter Backpack Size:

There are some points that you should focus on before buying a 40-liter backpack.

  • The Quantity and Number of the items you want to pack in a backpack.
  • The Torso Measurement of the backpack should be shorter or equal to your torso.
  • The Planned length of your hiking.

You should check out the below-mentioned things before buying a 40-liter backpack.

  1. The Number of Pockets in the Backpack.
  2. The Size of the Backpack.
  3. Addition Pockets.
  4. Padded and Breathable Shoulder Straps.
  5. The number of items that you can pack in it.

Our Top 2 Best 40 Liter Backpack Picks:

#1 Osprey Farpoint 40 Men’s Travel Backpack

Osprey is a well-reputed brand in the market of backpacks. This brand manufactures top-class backpacks for hiking, camping, and for much more different purposes.

Farpoint 40 is one of them. This backpack has a large storage capacity and U-zip duffle-style access to the main compartment.

The best thing about this backpack is that it meets the backpack size restriction for most airlines.Osprey Farpoint 40 Men's Travel BackpackOsprey Farpoint 40 Men’s Travel Backpack

  • Large, lockable U-zip duffel-style access to main compartment – 40L…
  • Meets carry-on size restrictions for most airlines (Size Medium/Large:…
  • Lockable zipper access to padded laptop & tablet sleeve (fits up to…

Buy on Amazon
Price incl. tax, excl. shipping

Last update on 2022-01-19 / Affiliate links / Images from Amazon Product Advertising API

There is also lockable zipper padded sleeves for the laptop (15 inches) and a scratchproof pocket for glasses.


  • Dimensions: 21″H X 14″W X 9″D
  • Volume: 40 Liters
  • Weight: 3 Pounds.


  • Large Capacity.
  • Easy to Carry.
  • Meets Carry-on size restrictions.
  • Decent Look


  • Doesn’t have a rain cover.

Check Customer’s Review Now

#2 MOUNTAINTOP 40L Unisex Hiking/Camping Backpack

MOUNTAINTOP backpack provides you large storage capacity. This backpack also provides you with a rain cover so your backpack remains safe during your hiking.

Last update on 2021-10-22 / Affiliate links / Images from Amazon Product Advertising API

The best thing about this backpack is that it provides you a hydration system in a separate bladder sleeve that is big enough for a 3 liters hydration bladder.

You can even put a laptop of 17 inches in that sleeve. The rain cover is kept in its own compartment.

It also has an adjustable hip belt and a belly belt which are not removable.


  • Dimensions: 21.3″*12.6″*8.3″
  • Weight: 2.16 lbs
  • Volume: 40 Liters
  • Material: Polyester


  • Large Capacity.
  • Waterproof and provide rain cover.
  • Easy to Attach Sleeping Bag To this Backpack.
  • Hydration-system compatibility


  • Belly Belt is not removable.

Check Customer’s Review Now

Frequently Asked Questions:

Is a 40l backpack carry on size?

The backpack that ranges above 45 liters is check-in at the airlines. So, you can use 40-liter backpack as a carry-on. Some backpacks provide you the capacity and still use as carry on.

How many Litres should my backpack be?

You must have a 20 Liter to 30 Liter backpack if you want to travel to the cities and visit some places. But in case you are hiking or camping then you should choose a 40 to 50 Liter backpack.

How big is 45 liters?

The common 45L volume is usually measured as 22 x 14 x 9 inches. You might also see a limit of 45 linear inches. Linear inches are the sum of the dimensions: length + width + height. The international max is 55 x 35 x 20 cm.

How big is a 30 liter bag?

30 liter backpack is enough large for the trip. You can put a lot of stuff in a 30L backpack. The dimension of 30 liter backpack is 17.7 x 12.6 x 7.87 (L x W x H) inches.

What is the best size for a day backpack?

The best size for a day backpack is 20 Liters to 35 Liters. This is an ideal size for a backpack. You can carry food, clothes, and other things like a camera, laptop, and books.

How big is a liter?

How Big Is a Liter? A liter bottle of liquor is 1,000 ml or 1 liter. That makes it 25% larger than a standard 750ml fifth. Buying a liter of liquor in the U.S. is about as common as ordering a liter of cola.

What size is a liter of water?

A litre is a cubic decimetre, which is the volume of a cube 10 centimetres × 10 centimetres × 10 centimetres (1 L ≡ 1 dm3 ≡ 1000 cm3).

What does a liter look like?

Liters are often written as L (for short), so “3 L” means “3 Liters” (some people use lowercase l, but that looks too much like 1). Milk, soda and other drinks are often sold in liters. on each side contains 1 liter, and a square meter that is 1 millimeter thick also contains 1 liter.


Now, you know how big is a 40 Liter backpack and you have an idea of whether this backpack is good for you or not.

As told you earlier a 40-liter backpack is a middle-sized backpack, so you can use it as per wish whether for hiking or for daily use. 40l backpack can store a lot of gear that you will require as per your need.

Just because I am suggesting you have a 40-liter backpack doesn’t mean that you can not have a big or smaller one.

You can absolutely go with other options too like 20, 30, or 50-liter backpacks but make sure they are the right choice for you.

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