This is a Platypus hydration system. I bought it for trail running, but I missed the opportunity to use it and it has been stored unused. It is completely unopened and unused, but it has been stored by a private individual for a certain period after purchase. Please understand that there is a possibility of aging deterioration, and we are looking forward to your purchase with that in mind. 1.8L BPA-free hydration system, BIG ZIP SL. - Brand: platypus - Model name: BIG ZIP SL - Capacity: 1.8L (60oz) - Features: BPA-free - Application: Hydration system - Purchase price: 3780 yen