Banjo Brothers' Small Seat Bag is perfect for carrying a tube, tire levers, patch kit, a mini tool and some food (each sold separately). It's made from heavy-duty 840-denier nylon with a wide-mouth opening for easy access. And you've got 360 degrees of visibility with reflective accents and a rear tab for a blinkie.
Capacity: 40 cubic inches
Dimensions: 5.75 x 4 x 2.75 inches