Convenient and portable, making this a perfect companion for a long run or cycling trek. Made of top grade TPU materials, it is anti-bacterial, extra heavy-duty and durable. Double-sided TPU thermal bonding technique avoids the use of glue or other toxic adhesives. This hydration pack is also equipped with a silicone watertight hose system that offers quick opening and easy sipping. Easy to fill with an extra large filling cap!