5-pack refill bladder kit for your Disposable hydration system that's 100% taste-free and BPA-free. It's fast. It's hygienic. It's recyclable. Just replace the used bladder with a new and GO! Bladders used only with drink water can be reused Specifications:DurableRecyclableTaste-freeBPA-freePVC-freeMaterial: PET/NY/PEFit in most packs Product Care; Disposable Bladder cleaning;Drain all remaining water and clean the bladder with mild soap and waterLet the bladder dry out completely while hanging/standing with the cap at the bottomBladders used with pure water can be reused number of timesBladders that have been filled with liquids other than pure water should be replaced after each use due to the risk of bacterial growth inside the bladder. Please recycle the used bladder by tossing it in a bin. Bladders that's worn out should be replaced with a new fresh refill bladder