The Revelate Designs Mag Tank 2000 Top Tube/Stem Bag uses the same zipper free magnetic access as the original mag tank bag but this one boast 50% greater capacity. Named after how many calories you are supposed to be able to stuff inside the Revelate Designs Mag Tank 2000 Top Tube/Stem Bag offers a giant storage capacity with a sleek design that tapers toward the bottom. This allows for clean pedalling, and one handed access. Keep in mind that because the Revelate Designs Mag Tank 2000 Top Tube/Stem Bag is so easy to grab snacks due to the large opening, it is also subject to getting wet in a heavy downpour.