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Leftovers and meal prep
All Containers›Shop by use case›Leftovers and meal prep›The date›Under the conditionsShop all leftovers and meal prep →
The date

Under the conditions

By Dwight Davis, Founder

On this page15
Four kinds of condition. And the label prescribes all four.

The clause

Under the conditions of handling, storage, preparation, and use prescribed by label directions.

Handling

How the product is moved and treated before it is stored. Which includes whether it has been opened.

Storage

The obvious one, and the one people think a date is about. Temperature, light and whether the container is sealed.

Preparation

Which for a formula is mixing. A date that assumes a preparation method assumes the water, the ratio and the vessel.

And use

How and over what period the product is consumed once prepared. Which is the condition furthest from anything a container controls.

All four prescribed by label directions

So the conditions are not general good practice. They are the specific directions printed on that package.

Which makes the date and the directions one statement

Reading a date without the directions it depends on is reading half of it.

And a different container changes at least two

Handling and storage, immediately. A transfer is handling and the new container is the storage.

This property draws no conclusion from that

Nothing here says what a household may do with formula or with any food. The structure is the content.

The structure is worth having anyway

Because it applies to every date on every package: a date is a claim under assumed conditions, whether a regulation spells them out or not.

Our temperature range field is one of those conditions, measured

Published on all 176 containers here, and 109 of them top out at 120 F.

Preparation is the condition furthest from a container

A formula is mixed with water at a ratio, and nothing about a jar affects that. Two of the four conditions are about the container and two are not.

And a second condition we publish is the material

109 PET, 45 PP, 20 HDPE and 2 glass. Which decides oxygen permeability and therefore how much of a nutrient claim survives a long storage.

Which is a storage condition a buyer can check

And is the one thing in this whole analysis our data actually supplies.

References

21 CFR 107.20(c) requires on the label of an infant formula a "Use by ______" date, "the blank to be filled in with the month and year selected by the manufacturer, packer, or distributor of the infant formula on the basis of tests or other information showing that the infant formula, until that date, under the conditions of handling, storage, preparation, and use prescribed by label directions, will: (1) when consumed, contain not less than the quantity of each nutrient, as set forth on its label; and (2) otherwise be of an acceptable quality (e.g., pass through an ordinary bottle nipple)." Nothing on these pages states what other federal date labeling requirements exist or do not exist. law.cornell.edu
The Davis Pack Supply catalog, measured 19 October 2026. A temperature range specification is published on all 176 containers in this group and takes exactly four values: -40 to 120 F on 109 containers, 0 to 240 F on 45, -100 to 190 F on 20, and -100 to 300 F on 2. So 109 of 176 top out at 120 F. The cold-tolerant groups stop at 120 or 190 F and the heat-tolerant group bottoms out at 0 F, so only the 2 containers rated -100 to 300 F span both a freezer and an oven. Catalog-wide the field takes nine values. A temperature range is not a statement that a container is microwave, dishwasher or oven safe; only a manufacturer can make those.
Written from 21 CFR 107.20(c) and from the catalog as it stood on 19 October 2026. Nothing here says what other federal date labeling requirements exist, how long any leftover keeps, or whether any container is microwave, dishwasher or oven safe: a published temperature range is not one of those statements and only a manufacturer can make them. The temperature range field is published on all 176 containers in this group and takes four values, of which only one, on two containers, spans a freezer and an oven.