No need to buy a bottle when you can simply replace the gasket. The Impresa gasket compatible with 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 compatible with 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 compatible with Thermoflask double wall water bottle lid replacement. A tight seal is important compatible with 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 compatible with Thermoflask lids Easy to Use -- The spout gasket with tabs compatible with easy replacement compatible with 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 compatible with lids and flat side down compatible with 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 compatible with 24/32/40/64oz Material: Silica gel colour: transparent Package Contents: 18 x Water Bottle Gasket(3 style, 6 of each style) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.