The SealTank M is the most waterproof top tube bag, designed for cycling in all weather conditions thanks to its welded seams and waterproof fabric. The special design ensures a perfect fit on your top tube, and the three Velcro straps keep your SealTank M securely in place. The unique waterproof zipper is easy to open, and the special blue interior lining makes it easy to find your items inside without having to take everything out.