Purchased several years ago and used for ultramarathons and the like. Includes a 1.5L Omega reservoir. https://runnet.jp/shop/itemPageAction.do?itemCode=18367&shopId=000000 Leak-tested and confirmed to be in good working order. This is a used item, so please understand. ----- AI Comments Below 【Brand Reliability】 CamelBak is a trusted brand among outdoor enthusiasts, particularly known for its hydration products. 【Functional Design】 This water tank has an easy-to-carry design, perfect for activities like hiking and cycling. The attached hose allows for easy hydration. 【Durability】 Made of high-quality materials, it is durable enough to withstand outdoor use. Thank you for looking.