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. Make sure their bags have enough space, but are not larger than necessary.
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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.
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.
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. 36–50 liters: These larger packs are ideal for trips that require additional clothing and gear, such as climbing, mountaineering or non-summer hiking.
Most bags range from about 30L (1,800 cubic inches) all the way to 100L+ (6,000+ cubic inches). I recommend a backpack around 40L-50L. Personally, I wouldn't go over 65L, but some people like a bigger bag.
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 backpack size: 40-44cm torso length and 55-69cm hip width. Medium backpack size: 45-49cm torso length and 70-87cm hip width. Large backpack size: 50-52cm torso length and 88-100cm hip width.
Whichever backpack you choose, it needs to match your torso length. To determine your size, reach behind your neck, bend your head forward, and find the C7 vertebra: It's the bone that sticks out the most on your upper spine. Next, locate the iliac crest. It's the top of the hip shelf on the sides of your hips.
You can check in any size luggage, but the most common checked bags are larger than typical 22” x 14” carry-on bags. The most popular size check-in luggage is 25- to 29-inches tall and various widths. Medium-sized check-in luggage measures 25-26” tall and around 18” wide.