The Birzman Belly R Top Tube Bag is a brilliantly sized and conveniently placed carrier that puts your nutrition, energy bars and other essentials front and centre for when you require a much need energy boost on your ride.Rain resistant top tube bagMaterial: 420D & 840D nylon (waterproof)Size: 16.5 x 10 x 4cm Attaching to your top tube via two adjustable Velcro mounting strap, the Belly B Top Tube Bag is big enough to hold energy bars and gels, but is small enough not to get in the way. Constructed from a waterproof 420D and 840D nylon fabric, it will keep the contents bone dry in any weather.