How is the volume measured? What is the method to come to 25L?

In looking at the dimensions, I see that competitor bags of around the same HWD have more around 30L. I assume this may be due to the amount of material used on the inside of the bag for dividing it up into each compartment.

Synapse 25 25L 20 x 13.4 x 9.1

vs...

Timbuk2 Uptown 30L 19.5 x 11.6 x 6.50

Tortuga Outbreaker 35L 20.3 x 12.9 x 8.2

In looking at the dimensions, I see that competitor bags of around the same HWD have more around 30L. I assume this may be due to the amount of material used on the inside of the bag for dividing it up into each compartment.

Synapse 25 25L 20 x 13.4 x 9.1

vs...

Timbuk2 Uptown 30L 19.5 x 11.6 x 6.50

Tortuga Outbreaker 35L 20.3 x 12.9 x 8.2

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