Hydrapak WaterGate - Hydrate smarter with this handy insert that eliminates the usual spill when drinking from wide-mouth bottles. Made of BPA-free silicone, the Watergate fits into our Stash 1L bottles as well as most others. Stop the splash and keep your water in your bottle - for when you need it most. Insert grips into 63 mm wide mouth bottles to provide an easier drinking experience Prevents water spilling and splashing when you're on the go Universal size, fits most wide-mouth water bottles (including HydraPak Stash 1L) Made of food-grade silicone that will not absorb or retain odors and tastes Safe and reliable, 100% BPA & PVC free