Hydrapak Hydration Bladder. The Hydrapak™ is a reversible reservoir constructed with enhanced durability which is 60% thicker TPU. The revolutionary design allows users to easily maintain cleanliness and the patented wide slide top opening allows for fast filling and secure seal. The bladder also fits into the FirstSpear hydration pouch which allows you to attach to most platforms.
To clean, simply slide open, reach in, reverse, and clean.