How Big is a 20L Size Backpack? An In-depth Guide

Backpack shopping is fun and pretty easy. But if you’re a newbie with your eyes set on a 20L bag, some things might seem unclear at first. For example, why do we measure backpack capacities in liters, and how big is a 20L backpack?

Is the size of a 20L backpack the same as its capacity?

In this article, we’ll explain how big a 20-liter backpack is and give you examples of things these backpacks can hold. Then, we’ll things off with answers to frequently asked questions about 20-liter bags.

Dive in to find out more.

What type of backpacks have 20l capacities?

Here’s a list of backpack sizes, their capacities, and suggested uses.

Size	Capacity	Suggested Uses
Small packs	5-10 liters	Kids bags, sports, picnics
Daypacks	10 to 30 liters	Commuting, hiking, school work
Medium backpacks	30 to 50 liters	Hiking, camping
Large backpacks	50 liters or more	Traveling, hiking

Generally, 20-liter backpacks are best suited for light packers and short trips. With this in mind, how can you tell how big a 20L bag is?

What can a 20-liter backpack hold?

One of the top ways to understand the size of a backpack is to estimate the things it can contain. Therefore, here are a couple of things that a 20L size bag can conveniently hold:

One 15-inch laptop or less
One average-sized water bottle
Two hoodies
Two average-sized binders
One small notebook
One large headphone

In practice, objects with similar volumes to those we’ve listed above will also fit a 20-liter backpack.

Understanding how to determine the measurement of a 20-liter backpack

With the knowledge of things that will fit a 20-liter backpack, let’s examine how manufacturers determine the capacity of these bags.

Generally, most backpacks have more than one pocket and compartment. Therefore, all manufacturers have to determine the volume of each pocket and compartment and then sum these volumes to get the overall volume of a backpack.

For example, picture water being poured in all the pockets and compartments of a backpack. The quantity of water that can fill a bag is its capacity and how big it is.

Volumes are generally calculated in cubic inches. However, since this isn’t the easiest metric to understand or the universally acceptable one, this capacity needs to be represented in liters.

While representing volumes in liters, measurements are rounded up for accuracy. This means that a 20-liter backpack has a dimension of 12220.47 cubic inches.

Volume calculations answer the question of how big a 20l backpack is, which implies what it can hold. On the other hand, its dimensions show the length, breadth, and width of the items that’ll fit in the backpack.

Who is a 20-liter backpack ideal for?

A 20-liter backpack is undoubtedly one of the best capacities for daily use. In determining whether a 20-liter bag is right for you, you’ll need to consider the following factors:

Your torso measurement
The number of things you intend to pack at a time
Your intended trip length

1. Torso measurement: In determining the length of your torso, you’ll need to follow these steps:

Tilt your head until you touch the lump that’s midway between your shoulder. This bone is called the C7 vertebra. It is the top of your torso length.
Move your hand to your hips. You should feel two hip bones on both sides. The distance between both bones is the bottom of the torso measurement. While measuring your hip size, you should ensure that you find the widest part of your hips.
Have a friend measure the length of your torso while standing erect.

Generally, you’ll want your torso length to match or be a few inches from the length of the backpack. If the length of a 20-liter bag is far larger than your torso length, then that 20-liter backpack isn’t the best fit.

2. The number of things to pack: With this factor, consider the things you can’t do without in your trip and whether the 20-liter backpack would suffice. There’s no need to get a bag a bigger capacity than what you need to get by.

3. Your intended trip length: As a corollary to the point we’ve mentioned earlier, longer trips will require you to pack heavy. 20-liter backpacks might not be the best fit for such. However, ultimately, your packing style is the most essential factor to consider.

FAQs

Q1. How many liters is a regular backpack size?

Normal daypacks usually hold 20 to 35 liters and can take a sleeping bag, clothes for a few days, and a three-day worth of food. Any bag that’s bigger than 35 liters is considered medium.

Q2. Is the volume of a backpack the same as the backpack’s dimensions?

The volume and dimensions are closely related measurements of a backpack. The dimensions refer to the size of items that can fit the bag. However, the volume is the capacity that a backpack can hold without tearing.

Q3. Is the capacity of small and hidden pockets included when calculating the volume of a 20l backpack?

Yes. The summation of all sides, inner and hidden pockets, and main compartments gives the total capacity of a backpack and your answer to how big a 20l backpack is.

Q4.What does a 20L backpack fit?

A 20 liter backpack can hold school essentials such as a few folders, notebooks and books as well as smaller items such as pens, calculators and tech accessories like chargers and cables. Most 20 liter backpacks have additional padded sleeves for a laptop or tablet for safe storage.

Q5.Is a 20L backpack big enough for a day hike?

11–20 liters: These compact packs are often built for hiking, mountain biking, running or travel. Some feature extra pockets for staying organized. Their capacity lets you carry an extra layer, food and gear for day trips. 21–35 liters: This is the sweet spot for most hiking and travel daypacks .

Q6.Is a 21 liter backpack big?

Medium size backpacks between 20-29 liters can be considered the Goldilocks of backpacks for most people. Not too small yet not too large – most everyday carry backpacks fall into the medium size category.

Q7.Is a 20l backpack big enough for school?

A school backpack with a capacity between 15 and 20 liters is large enough. These backpacks are compact, but often have extra compartments to store a calculator, pens, and keys. There are also plenty of small backpacks with a laptop and tablet compartment.

Q8.How much can a 20l bag hold?

Q9.Is a 21 liter backpack big?

Q10.What size is a 10 Litre bag?

Bags: Dimensions: length 500 x width 370 mm.

Q11.Is a 20l backpack big enough for school?

A bag that is 20-24 litres should always do the trick. However, children in their first three years of school won’t require much more than a book bag. Bags should never be heavier than your child can handle. For students with a number of books to carry, we recommend backpacks with wide straps.

In conclusion

Understanding what manufacturers mean by the backpack capacities they give can be tricky, especially if you’re backpack-shopping for the first time. If you see yourself muddling up these measurements for a 20-liter backpack, then not to worry. Everything you need to know about the actual capacity of a bag is included in this article.

To give you a clearer picture, we’ve provided examples of things it can hold. With these, you should now have a great idea of how big a 20l backpack is.

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