Details The Plexus is a versatile waist pack with a larger capacity that gives you the option to customize your gear and hydration to your adventure. This pack has the capacity to carry any of UltrAspire's handheld or bottle styles in the front quick stash pocket or a 1 liter bladder in the main zippered compartment. Specifically placed compression allows the pack to function empty or fully loaded and provides a more comfortable and stable ride. Inside the main compartment there is a mesh expansion pocket to keep small items close to your body. The back of the main compartment features XT Mesh which helps to wick and disperse moisture while preventing chafing. The bottom of the main compartment has been reinforced with a second layer of 30D fabric to strengthen the stress point, but also keep the pack lightweight. The front of this waist pack is also equipped with a functional 4-way stretch mesh pocket capable of carrying a large cell phone. In addition, it has two shock cords on the front attached to Hypalon fabric for strength that can carry Z-poles, jackets, or other apparel. One size fits most.