- Compatibility: Fits Hydro Flask wide-mouth bottles in 12, 16, 18, 20, 32, 40 and 64 oz sizes. Also compatible with Simple Modern, Iron Flask, ThermoFlask, BJPKPK, Hydro CELL, koodee and other wide-mouth bottles with an outer mouth diameter of 2.28 inch. - Durable construction: Bluwing lid has been upgraded twice to resist everyday bumps and drops. The reinforced design improves longevity so the lid stays reliable through regular use. - Safe material: Made from BPA- PP material to help preserve a clean drinking taste with no unpleasant plastic flavor. - Ergonomic drinking spout: The drinking mouth is shaped with smooth curves that follow ergonomic principles. Because lips are highly sensitive (nerve ending density about 100 times higher than fingertips), the polished, contoured spout provides a more comfortable, pleasant drinking experience. - Comfortable carry handle: The wide, thick handle fits three fingers and helps distribute the weight of a full bottle to reduce finger strain while walking or moving. - Easy to use outdoors and daily: Ideal for camping, hiking, kayaking or rock climbing — and practical for commuting, gym sessions, or everyday hydration. The secure fit and durable build make refilling and carrying simple in active situations. - What it solves: Replaces worn or broken wide-mouth lids with a robust, comfortable alternative that restores leak-resistant portability, improves mouth feel when drinking, and makes the bottle easier to carry without finger pain. - Specifications and fit: Designed specifically for wide-mouth bottles with an outer mouth diameter of 2.28 inch; confirmed fits listed Hydro Flask sizes and compatible brands above. - Performance: Two design upgrades and BPA- PP material combine to deliver a long-lasting lid that maintains water taste and withstands daily use.