Containers

Closures

On this page11

What is here The gap, measured against the archetype The liner is the substitute Which is the single most useful line item on this page Continuous thread is fine if the liner is right Dome lids for the wide jars Think about the vacuum And about reopening Standardise the neck across a set Specify the liner explicitly References

The archetype asks for gasketed. There is not one on the shelf.

What is here

283 continuous thread, 22 dome lids, 9 liners and sealing discs, 6 specialty, 5 flip top, 5 phenolic, 5 round tubs, 3 spouted, 3 tub and pail lids and 2 lug and twist.

The gap, measured against the archetype

"Wide mouth, gasketed." There are no gasketed lids here. For a store whose failure mode is moisture ingress, that is the specification and it is missing.

The liner is the substitute

9 liners and sealing discs. A good liner in a continuous thread cap is a real seal and it is the part nobody orders because the cap already came with something.

Which is the single most useful line item on this page

Salt caking, seed losing viability and an oxygen absorber exhausting itself are all the same failure: air moving through the closure.

Continuous thread is fine if the liner is right

283 of them. Simple, cheap, reliable, opened and closed repeatedly without wearing out, which suits a working pantry.

Dome lids for the wide jars

22 of them. Quick to open, which matters for a container you go into daily, and less good as a long-term seal than a lined screw cap.

Think about the vacuum

An oxygen absorber in a sealed rigid container pulls the closure inward. A lid that seals by resting rather than threading can be drawn in or distorted.

And about reopening

A long-term store gets opened once; a pantry jar gets opened daily. Those are different closure requirements and buying one closure for both is the usual compromise.

Standardise the neck across a set

A seed collection or a salt store is many identical jars. One neck means one box of spare caps and one liner specification.

Specify the liner explicitly

By name, on the order. It is the component that decides whether any of this works and it is the one left blank most often.

References

The Davis Pack Supply catalog, measured 19 October 2026. The emergency food and water shelf is 632 rows: 287 containers and 345 closures. 5 mL to 7,571 mL with a median of 237; 43 containers over a litre, 21 over a gallon, and none over three gallons. 153 PET, 65 HDPE, 45 glass, 24 PP. 210 jars, 59 bottles, 9 jugs, 8 tubs and pails, 1 tube. 93 clear, 66 white, 39 amber, 28 black, 24 natural. Closures: 283 continuous thread, 22 dome lids, 9 liners and sealing discs, 6 specialty, 5 flip top, 5 phenolic, 5 round tubs, 3 tub and pail lids.

The archetype behind this shelf is store-bulk-home: 950 to 8,000 mL, wide mouth, gasketed, PET and glass and HDPE, cold, solid, chunky, scooped, with "home pantry, wide mouth, gasketed, and it sits on a counter so it is seen" as its stated reason. It describes a kitchen canister rather than a long-term store, and the shelf sits mostly below even that window.

Written from 21 CFR 177.1520 and 21 CFR 177.1630, and from the catalog as it stood on 19 October 2026. We do not hold food-contact compliance documentation for any product and do not describe anything here as food grade; that is a statement from a manufacturer about a specific resin and its additives. No shelf life, water treatment or seed viability figures appear anywhere in this property, because none of them are a packaging question.