A: The L stands for Liters. So when you see a 25L backpack, that means the capacity of the main pouch is 25 liters.
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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.
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.
There is a very simple and easy way to determine the capacity of a backpack in liters. To do this, measure the linear dimensions - the height, width and depth of the backpack, then multiply these three values.
Most airlines allow backpacks as carry-ons, but size and weight restrictions vary depending on the carrier. 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.
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.
Multiday (3-5 nights; 50-80 liters)Packs in the 50- to 80-liter range are also great for shorter trips where you pack a little more luxuriously or multisport activities like backcountry skiing.
However, a good rule of thumb is to choose a backpack that can comfortably accommodate their textbooks, notebooks, laptop or tablet, and other essential items. A backpack with a capacity of 20-30 liters is usually a good choice for most high school students.
The hip belt of a well-fitting pack will be centered on top of your iliac crest. It won't be any higher or lower. If the hip belt slides below your iliac crest while you are trying on the pack, then it is too big. If it rests on your lower back, then it is too small.
However, a good rule of thumb is to choose a backpack that can comfortably accommodate their textbooks, notebooks, laptop or tablet, and other essential items. A backpack with a capacity of 20-30 liters is usually a good choice for most high school students.
30-50 liters: In general, luggage that has a capacity of about 50 liters or less is sufficient for a weekend trip. There are lots of carry-on duffels, packs and bags in this size range to choose from. 50-75 liters: For a trip that lasts one to two weeks, many people jump up to a bag in this range.
Most pack sizes are based on torso lengths, meaning that you select the torso measurement but are stuck with the size of the accompanying hipbelt. Some packs, however, are made with interchangeable hipbelts, allowing you to select both a torso size and hipbelt size (the Gossamer Gear Mariposa is one example).
The 15 Inch back pack's just-right size means you can bring the school supplies AND your favorite snack. Measuring 15 x 11 x 7 inches, these waterproof backpacks for teen girls and boys are perfect for school, practice, and travel.
A 50L+ backpack is a great friend to those travelling for a few weeks. These bags are spacious and can accommodate a number of outfit changes before you ever have to visit a laundromat. But don't be tempted to fill your pack to its capacity before you've even left - remember to save space for souvenirs!