Containers

What a milliliter search misses

On this page11

This is where the conversion stops being a curiosity Widen the question slightly and the answer changes completely So an exact search returns less than four percent of the real answer The same thing happens at every round figure Which is a usability fact rather than a data fault The fix is to search a band and not a figure And the system a row was recorded in does not follow the material Nor does it follow the size Which means the only reliable guide is the recorded unit string That is the shape of most useful findings on these shelves References

Ask for 250 and get two. Ask for 225 to 275 and get fifty seven.

This is where the conversion stops being a curiosity

A buyer thinking in milliliters asks for 250. This shelf has two rows at exactly 250 milliliters.

Widen the question slightly and the answer changes completely

Anything between 225 and 275 milliliters returns 57 rows. Forty seven of those are 236.588, which is eight fluid ounces and sits 5.4 percent under the figure asked for.

So an exact search returns less than four percent of the real answer

Two rows against fifty seven. Not because the shelf is thin at that size but because the shelf was specified in a different system.

The same thing happens at every round figure

Exactly 500 milliliters returns two rows and 450 to 500 returns 33. Exactly 100 returns two and 90 to 130 returns 48.

Which is a usability fact rather than a data fault

Every number in the column is correct. The problem is that a search for an exact value assumes somebody chose that value, and on 215 of 238 rows nobody did.

The fix is to search a band and not a figure

Plus or minus ten percent recovers the eight ounce rows from a 250 milliliter question and the sixteen ounce rows from a 500 milliliter one. A tighter band silently drops most of the shelf.

And the system a row was recorded in does not follow the material

All 71 polypropylene rows are in ounces. PET is 104 in ounces and 13 in milliliters. Glass is 40 and 10. So there is no shortcut that predicts which rows are converted.

Nor does it follow the size

The native milliliter rows run from 15 to 500 and the ounce rows from 22.18 to 473.176. The two systems overlap across almost the whole range of the shelf.

Which means the only reliable guide is the recorded unit string

A separate field, holding oz, ml or cc. It is the field that answers the question and it is not the field anybody sorts on.

That is the shape of most useful findings on these shelves

The number is right, the column is populated, and the thing worth knowing lives next to it. On this shelf it is a unit. On another it is whether a weight is per unit or per case.

References

The Davis Pack Supply catalog, measured 19 October 2026. Searching this shelf at exactly 250 mL returns two rows. Widening to 225 through 275 returns 57, of which 47 are 236.588 mL, which is 8 fluid ounces and sits 5.4 percent below 250. Exactly 500 mL returns two rows and 450 through 500 returns 33. Exactly 100 mL returns two rows and 90 through 130 returns 48. The system a row was recorded in correlates with material but does not follow it: all 71 polypropylene rows are in ounces, while PET is 104 in ounces and 13 in milliliters, and glass is 40 and 10.

The Davis Pack Supply catalog, measured 19 October 2026. Of this group’s 238 containers, the recorded capacity string is in fluid ounces for 215, in milliliters for 21 and in cubic centimeters for 2. The milliliter figure stored alongside it is arithmetic performed on that string: 1 oz becomes 29.573 mL on 4 rows, 2 oz becomes 59.147 on 29, 3 oz becomes 88.721 on 8, 4 oz becomes 118.294 on 44, 6 oz becomes 177.441 on 17, 8 oz becomes 236.588 on 47, 9 oz becomes 266.161 on 6, 12 oz becomes 354.882 on 19 and 16 oz becomes 473.176 on 31, with single rows at 0.75, 1.25, 1.5, 2.2, 8.4, 8.9, 10, 14 and 14.5 ounces. The 23 rows recorded natively carry 15, 30, 50, 55, 75, 100, 125, 150, 200, 250 and 500 milliliters, one or two rows each. There are 29 distinct capacity values across the 238 containers.

Written from 29 CFR 1910.1200 and from the catalog as it stood on 19 October 2026. That section is the Hazard Communication Standard and it governs the classification and labeling of hazardous chemicals in the workplace; it does not govern bits, blades, wheels or collets, and nothing here says it does. Nothing here determines whether any item is an article under paragraph (c), because that turns on a particular use. No container on this shelf is described as rated for any chemical, fluid or dust, and nothing here is guidance about handling a tool, about dust exposure, about ventilation or about protective equipment. This shelf is a subset of the store-small-dry shelf and the sewing notions property enumerates that shelf.