[ Compatibility]Perfect for hydroflask straw lid standard mouth 18 oz 21 oz 24 oz and many other s such as Simple Modern Ascent 12 17 20 24 32 64 oz, Klean Kanteen Classic 12 18 27 40 64 oz, Rehydrate Pro 17 25 oz, WaterVault Water Bottles 24 oz, The Coldest Water Standard Mouth 21 oz.[Durable & Safe]Made of - material, All material is BPA-free. Flexible handle improves grip comfort, makes straw lid a perfect standard mouth sports water bottle lid for hydroflask standard mouth lid replacement accessories.[Leakproof & Silence]More Fit Sealing Ring, so you can place hydroflask water bottle in a backpack or anywhere for jogging or outdoor travel. No need to worry about water leakage. The suction straw lid is tightly connected to your hydroflask water bottle so you don't have to worry about making unpleasant sounds when drinking.Blistering summer day, One-handed flip your hydroflask top to enjoy a cool drink. Flexible handle makes it easy to hang your hydroflask water bottle anywhere for jogging or outdoor travel.Material: pp+siliconecolour: BlackPackage Contents:1 x Water cup lid2 x straw1 x Cleaning brush