For 800ml, 1000ml, and 1500ml bottles (for 9cm diameter bottles) - Black Water Bottle Pouch, Handy Pouch, Protective Cover, Prevents Bottom Falling Out, for Thermos, Zojirushi, Tiger, and other Thermoses Color: Black Quantity: 2 Material: Silicone (Made of high-quality silicone, excellent durability) Use: Water bottle bottom cover Size: 9.0cm diameter (See images for other sizes) Durability: Made of silicone that is resistant to high and low temperatures and abrasion, and can withstand harsh environments.