41 cubic inches (6.25″ L x 2″ W x 3.25″ H). A famed shop in North Dakota with account #007 told our best rep – “We sell the “living #$%@” out of this bag” he said pointing to an inferior, but novel concept. “Can’t you guys do better?” Sure we can. Designed originally for triathletes (and ours still works great for that use), our Top Tube Bag is a great add-on to keep your must-haves (phone, wallet, keys) within reach. The clear top allows you to see what’s in there while keeping it all dry.