Carson's Tracker is a full featured binocular with fully-coated lenses that reduce internal glare, reflection, and produce crisp, bright images. Special coatings provide unsurpassed infra-red and ultra-violet protection, reducing eye strain and improve image contrast. The Tracker has a center focus knob with an independent right diopter to adjust maximum focusing flexibility for all types of vision. Roll-down eyecups for eyeglass wearers. When it comes to water hydration bladders, most can leave something to be desired. They can be tough to clean, might be leaky, may not hold their shape, and the valve might be difficult to use. None of this is true of the Hydrapak shape shift 3liter.I’m no expert on water bladders, but I can attest that this thoughtfully-designed product works well and is quite flexible (in more ways than one).
