Check the listing for details. 2 Pack Flgoo Standard Mouth Flex Cap Compatible with Hydro Flask / BLACK. Color: Black, Condition: New. Listed at 12.95 USD. Standard Mouth Flex Cap Compatible with Hydro Flask Standard Mouth Bottles - 2Pack (Black)Color: BlackBrand: FlgooItem Condition: New====Product description ====The lid is perfectly compatible with the 18/21/24 oz Hydro Flask standard mouth, as well as IRON Flasks/Simple Modern ascent narrow mouth bottles and other narrow mouth bottles with a diameter of approximately 1.7 "-1.9"(4.3-4.8cm)BPA Free, our replacement lid is made from high-quality, BPA-free material, the Lids are safe and durable, ensuring that you can enjoy your drinks with peace of mind, knowing that you're not exposing yourself to harmful substanceThe lid is Easy to carry, perfect for any outdoor activity. Comfortable to carry full bottle of Water. Whether you're hiking, biking or working out, our lids provides you with a hands-free hydration solution Safe and easy to use for both adult and kids. Select this popular style sport cap as replacement lid for hydroflask standard mouth is a great choice.