Delta Top Trunk Bicycle Bag Not Expanded: 12" x 5" x 7" | Volume 6.8 liters (420 cu. inches) Expanded: 12" x 5" x 8.5" | Volume 7.5 liters (458 cu inches) Internal zip pocket, size 13 x 5 x 7", volume 7.5 liters (458 cubic inches) Easily attachable trunk bag Weight: 417 grams Bike bag attaches securely to bike rack; includes removable shoulder strap Measures 13 by 5 by 7 inches; 7.5-liter volume Heavy duty 600 D woven polyester Expandable main compartment, internal zipper pocket Secure velcro fastening to the bike rack