The Birzman Belly B 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. Material: 300D Polyester (water repellent)Size: 18 x 8 x 4.5cmAttaching to your top tube via an 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 water-repellent polyester fabric, it will keep the contents bone dry in any weather. Featuring a roll down closure for easy opening and open side pocket with reflective Birzman logo detail for quick access to your mobile or snacks, the Belly B also has a rain cover for additional protection from rainfall.