Revelate Designs Gas Tank Top Tube Bag BlackRevelate Designs Gas Tank Top Tube Bag Black. The Gas Tank is a high volume top tube bag for carrying a ton of food and other gear. It offers substantial storage in an easy access case. Zip open a side for one handed access while riding or open up both when stopped for full panel access to the contents. One handed zippered access while riding Wrap around water resistant zipper to keep gear dry Fully padded with closed cell foam Hook and loop interior