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Valley Health Clinic, Acupuncture Clinic in Albany, Oregon
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How much liquid is in a bottle of Evil Bone Water?

Willard Sheppy Dipl. OM, LAc, BS

Willard Sheppy is a licensed acupuncturist (LAc) and Founder of Valley Health Clinic specializing in using Traditional Chinese Medicine to treat acute injuries and chronic conditions, and to improve sports performance and rehabilitation.

Picture of the top of Evil Bone water

Table of Contents

How much liquid is in a bottle of Evil Bone Water?

If you’re reading this because you opened a fresh bottle and thought, “Wait… why is there space at the top?”—you’re not alone. People are often dealing with pain, they’re counting on this bottle to last, and the last thing anyone wants is to feel shorted. So here’s the straightforward explanation of what you’re seeing, why it’s normal, and what we do on our end to make sure you’re getting what you paid for.

Quick answers (the numbers)

  • We list Evil Bone Water as 3.4 fl oz (about 100.6 mL).
  • That is the labeled net contents on the product listing.
  • The bottle itself is a “4.5 oz Boston Round” amber/brown glass bottle.
  • Our typical fill is more than the label amount usually around 4.0 fl oz.

In practice: the “shoulder” level (where the bottle starts curving near the top) is about 4 floz. Total fill is commonly around 4.5fl oz

So yes: even though the listing says 3.4fl oz, the bottle typically contains more than that often noticeably more.

Why there’s “empty space” at the top?

That space is called headspace, and it’s intentional. With spray-top bottles, headspace matters for a few reasons.

First, Boston Round bottles are visually deceptive. The bottle is straight on the sides, then it curves inward at the top (the “shoulder”). If you’re expecting “filled to the brim,” anything filled to the shoulder can look low especially because the curve hides volume in a way your eye doesn’t naturally estimate.

Second, the sprayer hardware needs room. The sprayer, dip tube, and cap assembly work better (and leak less) when there’s appropriate headspace. Overfilling increases the odds of seepage during shipping, especially if the bottle warms up in transit.

Third, liquids expand with temperature changes. A bottle that leaves our facility at a stable temperature can heat up in a delivery truck. Headspace helps prevent pressure buildup and leaking.

Why some bottles look lower than others?

Here’s the frustrating behind-the-scenes reality: it’s surprisingly hard to get the exact same “4.5 floz Boston Round” bottle forever.

There are hundreds of manufacturers and multiple middlemen. Suppliers sometimes swap to a slightly different mold, shoulder shape, or glass thickness based on what’s available and what’s cost-effective at that moment. Two bottles can both be sold as “4.5 oz Boston Round” and still have slightly different geometry so the fill line can look different even when the actual liquid volume is the same.

When we notice a bottle change, we recalibrate filling equipment. And because we know how people feel when they see that headspace, we often err on the side of overfilling (rather than trying to land right at a minimum).

Evil Bone Water

Evil Bone Water (Zheng Gu Shui) is a Chinese topical medicinal hand-crafted with only empirical grade herbal ingredients in an approved facility.

Get Now

Why list 3.4fl oz if the fill is closer to 4fl oz?

Because the label amount is a conservative “you will get at least this” number so you never get shorted.
In other words: the listed 3.4 oz is not a “best case.” It’s a floor. Our real-world fill is commonly above that, and we aim for consistency even when the bottle supply chain isn’t perfectly consistent.
Also it is easier to fly and travel with a bottle under 4fl oz

What to do if you’re still unsure?

If you ever receive a bottle that truly seems underfilled (not just “looks low because of the shoulder”), contact us. We’d rather fix it immediately than have you wondering whether you got shorted especially when you’re buying this for pain relief and you’re trying to make it last.

A simple way to sanity-check is to pour it into a measuring container with fluid-ounce or mL markings (carefully, and keep it away from flames/heat sources). But you shouldn’t have to do that. If it raises a flag for you, reach out and we’ll make it right.

Bottom line or Top line. (Get it)

The space at the top is normal. It’s headspace by design. The bottle is a 4.5 oz Boston Round, and the fill is typically around 4.0fl oz meaning there’s consistently more than the 3.4 oz listed.

What is a Fluid Ounces?.

A fluid ounce (fl oz) is a unit used to measure volume of a liquid—not weight. In the U.S., 1 fluid ounce is about 29.57 milliliters (mL). That means a 3.4 fl oz bottle holds about 100.6 mL of liquid. This is different from an ounce on a scale (a weight ounce), which measures how heavy something is. With liquids, volume is what matters for containers, dosing, and travel rules, because it tells you how much space the liquid takes up.

Travel Tips

Keeping the labeled amount under 4 fluid ounces also makes travel simpler because airport security rules for carry-on liquids are based on container size. In the U.S., TSA’s standard carry-on rule allows liquids in containers up to 3.4 fl oz (100 mL), packed in a quart-size bag. So a bottle labeled 3.4 fl oz is easier for customers to toss into a carry-on without thinking about whether it’ll get flagged.

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Will Sheppy, Founder and Acupuncturist at Valley Health Clinic
Willard Sheppy
Willard Sheppy is a licensed acupuncturist (LAc) and Founder of Valley Health Clinic specializing in using Traditional Chinese Medicine to treat acute injuries and chronic conditions, and to improve sports performance and rehabilitation.

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