No need to buy a bottle when you can simply replace the gasket. The Impresa gasket for Thermoflask lid replacement fits the 40 oz water bottle with straw lid and chug lid with spout top. Eliminate the hassle of ill-fitting generic gaskets. These are specially designed to match your preferred lid for water bottle use A Tight Seal to Prevent Leaks -- Whether you're exercising, commuting or traveling, no one wants a leaky water flask. Maintain a tight seal with the gaskets for Thermoflask double wall water bottle lid replacement. A tight seal is important for insulation to keep your drinks cold or hot. Protect your belongings from water damage and replace worn out gaskets in your water bottle cap Extend the Lifespan of Your Water Bottle -- Keep your 40oz insulated water bottle in top shape with this essential component. Improve hygiene by replacing old gaskets that may have dirt and debris buildup. Protect the functionality of your chug lid with spout or straw lid water bottle with the Impresa gasket for Thermoflask lids These food safe silicone gaskets for Thermoflask water bottles come in a pack of 3 for each lid type, with a total of 9 replacement gaskets Easy to Use -- The spout gasket with tabs for easy replacement for Thermoflask water bottles makes your accessory upkeep quick and simple. Remove the existing gasket by gently pulling it out. Insert the gasket tab side up for lids and flat side down for spout. It's made of food grade silicone with no BPA and is dishwasher safe. Replace every 4-6 months depending on frequency of use for 24/32/40/64oz Material: Silica gel colour: transparent Package Contents: 9 x Water Bottle Gasket(3 style, 3 of each style)