The Ultralight/Watertight Series has been redesigned for 2010 and now features proprietary DryFlex bags for the ultimate in ultralight, waterproof storage. For the multi-sport athlete that refuses to be let down or weighed down by his or her gear. The .5 is a great kit for one-to-two-day solo trips when you want an ultralight kit with basic first aid essentials. The outer nylon bag protects the kit while giving you space to bring along any personal extras.