Why is the capacity of backpacks always measured in litres?
The most important thing that involves the measurement of backpacks is the volume and size of the backpack. Volume is nothing but how much capacity the bag has to hold the contents in it. Volume is generally measured by liters or cubic inches. Size is nothing but the dimensions of the bag. As volume provides a good indication of how things are rolled into the backpack, it is generally more preferable. Hence, it is measured in liters.