Mountain biking, hiking, trail running, hunting, scouting, and snowshoeing are just a few of the many different activities that the Surge Redline Hydration Backpack will support. Designed with ergonomics, lightweight, and usability in mind, the Surge will be your perfect companion. Lots of pockets and expandability make it easy to carry all of the gear you need. Whether it is attaching trekking poles to the side of the bag or shedding layers on the early morning ascent, the Surge Redline Hydration Backpack will make your adventures more enjoyable. Need more room? The  is the next level up from the Surge Redline. It is larger in size, lightweight, and includes a waist belt for stable carry.