What Lid Fits My Wide Mouth Water Bottle? How to Measure the 2.28 in Neck
If your bottle's threaded neck measures about 2.28 inches (roughly 58 mm) across, it takes a wide-mouth lid — the size that fits Hydro Flask, Nalgene and most wide-mouth bottles. Measure the neck once with a ruler, match it to the "fits 2.28 in neck" line on a lid listing, and you'll know what fits before you buy.
Why the neck size matters more than the bottle size
Lids are sold by opening, not by capacity. An 18 oz bottle and a 32 oz bottle can take the exact same wide-mouth lid, because the neck is the same size even though the body is not. That's why our wide-mouth lids list a range of bottle sizes — from 12 oz up to 64 oz — instead of a single one. Buying by ounces is the most common reason a new lid doesn't fit.
How to measure the 2.28 in neck, step by step
- Take the lid off and empty the bottle. Set it upright on a flat table.
- Lay a ruler straight across the top of the threaded neck. Measure from the outside edge of the threads on one side to the outside edge on the other, passing through the center.
- Read the number. About 2.28 in (roughly 58 mm) means a wide-mouth neck. A clearly narrower opening — one you can't drop a normal ice cube into — is standard mouth, and wide-mouth lids won't fit it.
- Check the listing. Compare your number with the fit line on the lid page. Our Loop Lid listing, for example, says "Fits 2.28 in Neck 12-64 oz Bottles." Some listings also name bottles a lid does not fit, so read that line too.
No ruler? The quick check is the ice-cube test: if a regular ice cube drops in without squeezing, you most likely have a wide-mouth bottle. Confirm with a ruler before you order.
What lid fits a wide-mouth bottle?
Once you know you have a 2.28 in neck, pick the lid by how you drink. If you carry coffee or tea, the NuRich Flip & Sip Coffee Lid turns a wide-mouth bottle into a travel mug. From the listing:
- Flip-top opening for one-handed sipping, with a rubber stopper that helps prevent leaks
- Fits 12, 16, 18, 32, 40 and 64 oz wide-mouth bottles, including Hydro Flask wide mouth and NuRich wide-mouth bottles
- Durable, BPA-free and easy to clean
- $9.99, currently available in Black
If you'd rather chug water and carry the bottle on one finger, the NuRich Loop Lid has a chug spout, a carry loop and a rubber gasket inside, and it's top-rack dishwasher safe and BPA-free ($9.99).
Two mistakes that cause most bad fits
Buying by ounces. Capacity tells you nothing about the opening. Always go by the neck.
Assuming every "wide mouth" is identical. Most wide-mouth bottles share the 2.28 in neck, but not all do. The listing's stated fit — and any "not compatible with" note — is what counts.
How to check the fit when the lid arrives
Thread the lid on until it seats firmly. Fill the bottle halfway, close it, and hold it upside down over the sink for a few seconds. If you see drips at the threads, take the lid off and make sure the rubber gasket inside is seated flat, then try again. If it still drips, our post on why a water bottle lid leaks walks through five things to check.
Find your lid
Measured a 2.28 in neck? Start with the Flip & Sip Coffee Lid for hot drinks, or the Loop Lid if you want a carry loop and a chug spout. Want to compare more styles first? Read our replacement lid compatibility guide or standard mouth vs. wide mouth lids.
FAQ
How do I know if my water bottle is wide mouth or standard mouth?
Measure straight across the threaded neck. About 2.28 in (roughly 58 mm) is wide mouth. A noticeably narrower opening is standard mouth. Wide-mouth lids only fit wide-mouth necks.
Do all wide-mouth lids fit all wide-mouth bottles?
Most wide-mouth bottles share the 2.28 in neck, but not every one. Check the lid listing's fit line and any "not compatible with" note before you buy.
Will a wide-mouth lid fit my 18 oz and my 32 oz bottle?
Yes, if both bottles have a wide-mouth neck. The Flip & Sip Coffee Lid lists 12, 16, 18, 32, 40 and 64 oz wide-mouth bottles, and the Loop Lid lists 12–64 oz bottles with a 2.28 in neck.
Does the Flip & Sip Coffee Lid fit a Hydro Flask?
It fits Hydro Flask wide-mouth bottles. It does not fit standard-mouth bottles, which have a narrower neck.
Is the Loop Lid dishwasher safe?
Yes. The listing says it can be washed on the top rack of a dishwasher.
Written by the NuRich team in Winder, GA. We cite primary sources and only state what's on our product listings.