Quick answer
The MiiR Leakproof Straw Lid fits all standard MiiR wide-mouth bottles, including the 360, Camp Cup, and standard 750ml/1L bottles. It uses a press-fit design and requires a trimmed straw for a secure seal.
Why bottle compatibility matters
Not all lids fit every bottle. The MiiR Leakproof Straw Lid is designed for wide-mouth bottles with a standard thread pattern. It won't fit narrow-mouth or older MiiR bottles with a different threading. If you're unsure, check your bottle's mouth diameter—it should match the lid's press-fit opening.
The lid's leakproof seal works at high altitudes and during active use, but only when the straw is trimmed to the correct length. A straw that's too long will push the lid open, causing leaks.
Straw trim guide for a perfect fit
The Leakproof Straw Lid comes with a straw that needs trimming based on your bottle size. For a 750ml bottle, trim about 1/2 inch off the straw. For a 1L bottle, trim about 1 inch. The goal is to have the straw sit just above the bottom of the bottle without touching it. If the straw touches the bottom, it can push the lid open.
Decision rules for the Leakproof Straw Lid
- Check your bottle mouth: Measure the mouth diameter. The Leakproof Straw Lid fits standard wide-mouth MiiR bottles (approx. 1.75 inches / 44mm opening). It does not fit narrow-mouth bottles or older models with different threading.
- Trim the straw: For 750ml bottles, trim 1/2 inch off the straw. For 1L bottles, trim 1 inch. The straw should not touch the bottom of the bottle. If the straw is too long, the lid may leak. Trim carefully and test before filling.
- Press-fit installation: Align the lid with the bottle threads and press down firmly until it clicks into place. Twist to lock. No threading required.
Product facts
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Leakproof Straw Lid: Designed for a seamless, spill-free hydration experience, the MiiR Leakproof Straw Lid ensures no leaks—even at high altitudes. This makes it a reliable choice for travel, hiking, and commuting where spills are a concern.
Leakproof Straw Lid
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Leakproof Straw Lid: Available in black & white to customize your bottle. You can match the lid to your bottle color or mix and match for a personalized look.
Who should choose the Leakproof Straw Lid?
Best for
- Daily commuters who want one-handed sipping without removing a cap
- Hikers and travelers who need a leakproof seal at altitude
Not ideal for
- Narrow-mouth bottle owners (check your bottle first)
- Users who prefer a wide opening for ice cubes or cleaning