Its compact size makes it the ideal choice for a range of sizes, from kids to adults. The 12L capacity fits a 13” laptop, tablet, smaller electronics, jacket, lunch, and everyday essentials.
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24-26 liters is considered a medium-size backpack and is probably the most popular bag capacity out there. It's great for taking to school or work, depending on the styling, and can also be a great travel pack for taking on a plane.
SMALL BACKPACKS (< 20L)Suitable for everyday carry, tech carry, day travel, tablets… While a capacity of <20L is considered a compact size for a backpack, don't let that fool you. If the backpack is built well and is fully utilized, you should still be able to fit lots of essentials into it.
Understanding Backpack SizesAs a rule of thumb, 25-30 liter backpacks are best for shorter weekend trips, while 30-45 liter backpacks are best for longer trips or long-term travel.
Admittedly, I have many, many backpacks, and I often get more looking for an ideal backpack for the occasion. I got the XL (30L) version of this backpack.
LARGE BACKPACKS (> 40L)They make for great travel bags when you don't want to check in luggage. Even if you're a heavy packer, you should be able to take a 45L pack away for a weekend. A light packer could easily do with a bag like this for a week.
Parents are often surprised at how much their child's backpack actually weighs. As a general rule, to prevent injury, a full backpack should weigh no more than 10 to 20 percent of your child's body weight. How a student wears a backpack is often just as important as its overall weight.
With that advice and our testing in mind, this is the broad size guide we recommend: Under 10 liters: Slings and waist packs in this size work for everyday basics. 10 to 19 liters: For light loads and 13-inch laptops. 20 to 29 liters: Best for students and 15- to 16-inch laptops.
2-3 Day Packs: 35-50 litersA weekend backpack like a standard 40L backpack is big enough to carry a backpacking sleeping bag, small tent, and pad, as well as extra clothing and layers.
This is why most new backpackers think they need a larger backpack to travel, but with some clever organising and good packing cubes, a 40L backpack could just be the perfect size. You'll be incredibly surprised at just how small of a space you can fit everything you need for 3, 6 or even 12 months.