Backpacks are measured by the total capacity of all of the pockets in litres. Essentially, you'll be able to fit 30 litres of gear in a 30 litre backpack. This however might not mean a great deal when you are trying to decide if a backpack is big or small enough for your needs.
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A: The L stands for Liters. So when you see a 25L backpack, that means the capacity of the main pouch is 25 liters.
The 30L pack is best suited for:1-bag-travel for trips 3 days and under. Day bag use: perfect for exploring, commuting, and working, in a new place, or in your hometown. Your carry-on personal item: fits more easily under airline seats.
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.