How big should my backpack be for school?

Backpacks should be no longer than a child's back. The ideal height and width can be found by taking 2 measurements of a child's back, or by using an average child size chart (see Below) and adjusting as necessary. The core and hip muscles carry much of a backpack's weight so support is key.



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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. 30 to 39 liters: For super-size workloads and weekend trips.

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A backpack with a capacity of around 20-30 liters should be sufficient for 11th and 12th grade students. This size can accommodate textbooks, notebooks, a laptop or tablet, and other necessary school supplies.

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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.)

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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!

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This means it's something you could happily take on a weekend away if you're a light packer, or as a day bag if you need to take a lot of stuff. Another good size for plane travel as well, without any concern with carry-on compliance. Here's a packing list for what you can fit in a 32-34 liter backpack.

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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. There's enough capacity to hold food, clothing and some extras, like a camera and a book.

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Is 45 liters too big for a day hiking pack? Yes, 45 liters is more space than most people will need in a day hiking pack. The sweet spot for day packs is more like 15 – 30 liters, which is enough space for a day's worth of food and water, warm layers or rain gear, safety essentials, and other small items.

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Backpack size: 18×13.2×11.6; Capacity: 42L. With its large size and multiple pockets, this bag is ideal for storing your clothes, first aid kit, water bottles, food for 3 days and other survival tools.

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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.)

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Gregory Mountain Products Icarus 30 Liter Kid's Hiking Backpack has an official 20 lb (9.1 kg) load capacity. Gregory Mountain Products Zulu 30 Liter Men's Hiking Daypack's official load capacity is 35 lb (16 kg).

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The sweet spot for most daypacks, having a pack in the 20-30 liter range will mean that you can certainly carry all of the essentials, up to and including: Food for the day (again, a decent lunch)

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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.

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If you will potentially need that extra capacity on a future trip, then definitely get the 75L pack. If you're doing it just because it doesn't seem like much extra weight, even if you don't expect to ever need it, I would go for the 65L pack. That would also curb the temptation to overpack.

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Size Matters (but Bigger Isn't Better) Like a few other things in life, size matters when it comes to choosing a backpack — but not in the way you might think. Based on many years of dragging excessively large backpacks around the world, I have to say bigger is not better. You do not need an 80 or 90 litre pack.

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But bags larger than 65L are way too big for travel, even on extended trips. If you'll be traveling for more than a week or two, you'll need to do laundry anyway. You can't—or at least shouldn't—try to carry a month's worth of dirty clothes. Between these two extremes is the sweet spot of backpack sizes.

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