Tenmile Daypack Black. Weâ??re constantly testing our products in the worst conditions all around the world to make our products perform even better. Explore how we test, and share your toughest moments of testing here. The Columbia Tenmile Daypack has a 23.4 L (1428 cubic inches) stow capacity, and comes with a lifetime warranty. The rain flap over the zippers keeps water away from packed items, and the eyewear holder loop on the shoulder strap keeps your glasses close, just in case. Patented Omni-Shield delivers protection from outdoors where you least expect it but need it most.