Overall: 13″ wide x 8″ deep x 18″ high. Interior: 12.5″ wide x 7″ deep x 17″ high. Side Pocket (2): 4.5″ wide x 7.5″ high. MP3 Pocket: 7.5″ wide x 3.5″ high. Small: 8.5″ wide x 0.75″ deep x 8″ high. Laptop Pocket: 12.5″ wide x 13.5″ high.