• Easy filling and cleaning: The big opening makes for easy pouring of water.
• Water reservoir is pressure-tolerant and wear-proof, manufactured with leak proof sealing technology and high smooth interior surface.
• Clean food grade TPU material: Taste free, non-toxic,the whole hydration bladder is made of premium anti-bacteria material for free mouthpiece. 
• Insulated tupe: can withstand the cold temperatures of high altitude climbing.
• The mouth piece uses a bite valve technology that makes it easier to drink.
• some people call these camel back. It s a famous global brand but we are not affiliated.