How to Measure Backpack Dimensions？
How to Measure Backpack Dimensions？
If you are trying to measure the volume of a bag at home, the simplest way to do it is to multiply out the dimensions that you gathered in the “Measuring Dimensions” section above and then multiply the length by the width by the height of the bag to get a rough estimate of its volume.
Often, the volume of a backpack is expressed in liters. While measurements in cubic inches can be more accurate, using liters for volume is a rising standard in the backpack world that won't go away any time soon.
Now that you have an understanding of both volume and exterior dimensions, let's combine the two as best as we can.
While the volume of a bag cannot determine how large it will be on the outside due to the inconsistencies in measuring practices, we can generalize how large bags of a particular volume usually are.
8L backpack: 17” x 8” x 5”
25L backpack: 21” x 11” x 6.5”
30L backpack: 21" x13.5" x 9.5"
40L backpack: 21” x 14” x 9”
50L backpack: 29.5" x 13" x 10"
70L backpack: 28" x 14" x 12"
110L backpack: 30” x 18.5” x 12.5”
The size of the backpack that you choose depends not only on the volume that it can carry but also the size of your body and the length of your back.
