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.
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No matter how well-designed the backpack, less weight is always better. Use the bathroom scale to check that a pack isn't over 10% to 20% of your child's body weight. For example, a child who weighs 80 pounds shouldn't carry a backpack that weighs more than 8 to 16 pounds.
The typical conventional backpacker has a base weight around 25 to 30 pounds. Conventional backpacker's total pack weight with food and water can easily exceed thirty to forty pounds.
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.
No matter how well-designed the backpack, less weight is always better. Use the bathroom scale to check that a pack isn't over 10% to 20% of your body weight (for example, if you weigh 120 pounds you shouldn't carry a backpack that weighs more than 12 to 24 pounds).
Textbooks and school supplies, plus gym gear, electronic devices, lunches and more contribute to overloaded backpacks. In fact, about 70 percent of kids carry heavier-than-recommended backpacks, researchers reported a few years ago in the journal Applied Ergonomics.
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.)