A school backpack of 21 to 30 liters is suitable for you. This is the most common size for backpacks. The bag has enough space, but does not exceed the required size. Most school backpacks have several small pockets.
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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.
Backpack capacity is almost always measured in liters - a universally accepted standard unit - which makes it much easier to compare backpack sizes across brands. As 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.
A backpack with a capacity of 20-30 liters is usually a good choice for most high school students. This size should be large enough to carry their everyday items while still being comfortable to wear and not too bulky.
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.
Should I size up or size down? We recommend sizing down if you are between sizes. It is very important that the waist belt is able to securely tighten around your hips. If your waist belt is too big you will have a hard time getting the weight in your pack to transfer from your shoulders to your hips.
How much is too much? A 50-pound child should carry a maximum of 7.5 pounds. A 100-pound child should carry a maximum of 15 pounds. A 150-pound child should carry a maximum of 22.5 pounds.
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.
Trips of 5 days or more usually call for packs of 70 liters or more. These are also usually the preferred choice for winter treks lasting more than 1 night. (Larger packs can more comfortably accommodate extra clothing, a warmer sleeping bag and a 4-season tent, which typically includes extra poles.)
We suggest looking for a roomy bag with plenty of organizational compartments, including a dedicated laptop sleeve (we've also got cool laptop backpacks if you're looking for some). Wide, cushioned straps and back panel padding can help distribute the weight evenly and provide ample back support.
MEDIUM BACKPACKS (20 – 35L)This capacity range 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.
10 to 19 liters: For light loads and 13-inch laptops. 20 to 29 liters: Best for students and 15- to 16-inch laptops. 30 to 39 liters: For super-size workloads and weekend trips. 50 to 80 liters: For hikers and campers.