Two size design, choose your favorite size! Big size: 18.9"(L)*5.9"(W)*11.8"(H); Small size: 15.0"(L)*5.1"(W)*10.2"(H).
Note: only the small one comes with a removable and adjustable strap.
Internal structure: with several rooms to keep things well organized, 2 pocket-style organizers, 1 big zipper pocket in the middle, 2 small zippered areas.