The Rocket Pocket XL actually reduces drag caused by stem and headset spacers and therefore is the ideal top tube mounted bag for racing or training to carry energy food and other items. Instant access while riding. Carries all your essential needs including Gels, Energy Bars, Salt or Electrolyte Tablets, Cell Phone, Driving License, and Keys etc. Features a large, one-handed zipper for ease of access and silver colored interior with red stretch interior mesh to find contents easily. Non-slip surfaces on bottom and front of bag provide additional stability and the insulated sides keep your contents cooler.