Well shaped, plenty of room. The width of the bike frame bag is 2.2 inches. And thewhole tube bag padded with EVA foam, which not only protects the inside items, butalso can well maintain the triangle shape and provide as large as 1.5L capacity, caneasy to store most essentials like smartphones, wallets, keys, mini bike pumps, cableDimensions: 10.6" x 8.3" x 6.7".