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Home preserving
All Containers›Shop by use case›Home preserving›Getting started›The jar without the lidShop all home preserving →
Getting started

The jar without the lid

By Dwight Davis, Founder

On this page13
183 closures, and none of them is the one.

What home canning needs

A two-piece lid: a flat lid carrying a sealing compound, and a separate screw band that holds it during processing and comes off afterwards.

Why two pieces

Because the seal is made by vacuum rather than by the band. The band is a clamp during the process and the lid holds itself down once the jar cools.

Which is why it cannot be substituted

A continuous thread lid screwed down tight is held by the thread. It does not form a vacuum seal and it does not release during processing.

And there is not one in this catalog

183 closures indexed to this group: 131 continuous thread polypropylene lids, 27 metal or aluminum CT caps, 12 dome lids, 11 metal lug or twist caps, 1 sealing disc, 1 metal overshell lid.

Checked catalog-wide as well

There is no two-piece canning lid and no band anywhere in the catalog, not only not on this shelf.

While the jar is here

8 glass mason and paragon jars out of 20 containers. The jar that the whole craft is named after, with nothing to close it for that purpose.

Which is the sharpest single-article gap in this library

Not a routing failure and not a data gap. One article, absent, and it is the article the central leaf is defined by.

The 11 metal lug or twist caps are the nearest thing

A lug cap on a glass jar does form a vacuum seal, which is how commercial preserves are packed. It is not a home canning lid and it is a different process.

So one leaf of eight cannot be served

Home canning. The other seven are fermenting, pickling, dehydrated storage, freezer portion, kombucha, sourdough starter and yogurt.

And several of those are well served

A fermenting crock wants a wide mouth glass jar, and this shelf is 19 glass containers with necks at 63TW, 70-400, 70TW and 89-400.

183 closures for 20 containers is the most lopsided ratio here

Better than nine to one, and the depth is in plain lids rather than in functions.

Which is the pattern worth naming

A large closure count is not a wide closure range. 131 of the 183 are the same plain lid.

References

The Davis Pack Supply catalog, measured 19 October 2026. Home canning uses a two-piece lid, a flat lid carrying a sealing compound plus a separate screw band. The 183 closures indexed to this group are 131 continuous thread polypropylene lids, 27 metal or aluminum CT caps, 12 dome lids, 11 metal lug or twist caps, 1 sealing disc and 1 metal overshell lid. None of them is a two-piece canning lid or a band, and a catalog-wide check finds none either. The shelf nevertheless holds 8 glass mason and paragon jars.
The Davis Pack Supply catalog, measured 19 October 2026. 203 rows: 20 containers and 183 closures, which is the second smallest container count in this library and the most lopsided closure ratio measured anywhere, at better than nine to one. 266 to 1,893 mL with a median of 473; 11 over a pint and 5 over a quart. 19 glass and 1 PET. 18 clear and 2 amber, which is the most monochrome shelf measured. 8 glass mason and paragon jars, 6 glass straight sided jars, 3 glass hex jars, 1 PET wide mouth container, 1 glass wide mouth short jar, 1 french square. Nine distinct neck finishes across 20 containers: 5 at 63TW, 4 at 89-400, 3 at 70-450G, 2 at 70TW, 2 at 70-400, and singles at 110-405, 70-450, 63-400 and 48-400. Liners on the closures: 53 heat induction seal, 28 F217, 22 pressure sensitive, 18 No Liner, 16 Plastis standard, 13 PE foam, 12 unrecorded, 11 Plastis pasteur, 9 foam. Buyability, a snapshot: 14 of 20 available, 6 not; 7 quote only; 19 of 20 full case only, with case packs from 12 to 144 and a median of 72.
Written from 21 CFR 114.3 and 114.80 and from the catalog as it stood on 19 October 2026. Part 114 governs commercial processors of acidified foods; home canning for a household is not commercial processing, and low-acid canned foods fall under part 113 which is a different and more demanding part not described here. Nothing on these pages tells anyone how to preserve anything, and cottage food laws, which are state law, are what actually govern a home preserver selling jars. There is no two-piece canning lid anywhere in this catalog.