This waterproof backpack is the right size for everything from motorcycles to boats. It has a durable, fully welded waterproof TPU construction, IPX7 rated submersible zippers, a removable internal support structure, and a built-in purge / air valve to keep your belongings safe and dry. Includes a detachable shoulder strap and external cargo net, as well as a full kit of straps for a number of secure mounting choices on motorcycles, ATV / UTVs, jet skis and other marine vehicles.

Dimensions are as follows:
-18 "(45.7cm) wide
-11" (28cm) high
-11 "(28cm) deep

Fits! : Passenger seat (with or without sissy bar) or Rack Mount Four-point mounting is required for installation.