The latest model OutThere 2 Liter Hydration Reservoir is produced from premium Bio friendly recyclable materials. It is BPA FREE, Non Toxic with no Phthalates. The material is Anti-microbial treated against microbes as well as mold and fungus, and highly resistant to plastic taste or smell. The roll-top designed opening allows for fast fill and easy internal cleaning. It also has a push lock detachable hose (this feature aids in maintaining a sanitary, mold free drinking hose) with a twist lock, fast flow, soft bite valve.  

Fits great in all of our pack models!