Actual volume is 11.5 liters

Reviewed by Adriana from California on Friday, March 16, 2018
It's lightweight and seems well made BUT it's tiny. The printed measurements are 6 * 10 * 15 inches, which would be 900 cubic inches. That's less than 15 liters. The pack itself is smaller than the printed measurements--It's actually 5 * 10 * 13 in the front and 15 in the back (it's a wedge shape), so that's roughly 11.5 liters, which is far less than half the advertised size.

So it's an ok size for a sweatshirt and a sandwich but far smaller than a daypack. So it's going back.