Can I sell jam in non-mason jars with one-piece lids?

Only if the process behind the jar was designed for it. Tested home canning methods, and the cottage food rules built on them, assume mason-type canning jars with two-piece self-sealing lids processed in boiling water [1][2]. Hex jars, straight-sided commercial jars and one-piece lug caps belong to commercial methods such as hot-fill-hold, where a process authority or your state program approves the combination of product, jar, closure and fill temperature [3]. So the answer depends on where you make the jam: a cottage kitchen should stay with canning jars unless its regulator says otherwise, and a licensed kitchen can move to commercial jars once its process covers them. This page explains the difference and what buyers expect.

Why the jar and the process go together

A processing time comes from testing a particular product, in a particular jar, with a particular closure, under a particular heat treatment. USDA's jam and jelly instructions call for pre-sterilized Mason jars, self-sealing two-piece lids and "a 5-minute process (corrected for altitude, as necessary) in boiling water" [1]. The University of Georgia's jam and jelly bulletin describes the same standard two-piece metal lid system on half-pint and pint mason jars, and for any other lid system says to "follow the manufacturer's directions" [2]. Penn State's commercial primer tells producers to follow university extension methods exactly, including the container size and the processing method [3].

Change the jar or the lid, and you are no longer doing the tested process. The jam may be fine, but nobody has shown that it is.

The two systems side by side

How hot-fill-hold uses a lug cap

Penn State describes the commercial method this way: fill the hot product at at least 185°F into jars with 1/4 inch headspace; pre-sterilize jars if the fill temperature will be below 180°F; preheat jars to within 60°F of the fill temperature so they do not crack; then seal, invert and hold the jars for at least 2 minutes so the hot jam heats the cap, and turn them upright to cool [3]. Penn State also describes an alternative for commercial makers who water-bath process: use lids with heat-resistant plastisol gaskets made for hot water bath processing and follow a university extension method exactly [3].

Hot-fill-hold is a commercial process. Whether hot-fill-hold is acceptable for your product, and with what jar and cap, is a decision for a process authority or your state regulator. Temperatures, hold times and why it is not a home method are on hot-fill-hold and commercial filling.

What a cottage producer can do

Read your state's rule first. Some states tie cottage jam directly to a process. Washington, for example, limits cottage jams to products that meet the federal standards in 21 CFR 150, made with a cook step (hot fill or water bath) in sterilized containers, with no paraffin [4]. Michigan's cottage list specifies fruit jams and jellies in glass jars stored at room temperature [5]. Most state pages say less, which leaves the question to the agency that reviews your registration.

In practice:

1. The safe default is a canning jar with a new two-piece lid, processed by the tested method at your altitude. That is what nearly every state's cottage guidance assumes.
2. If you want a hex or commercial jar, ask your state program in writing whether it accepts that jar with that closure for your product and method. Keep the answer with your records.
3. If the program says it needs a process authority's review, that is a paid letter for a specific product in a specific container. Finding one, and what it costs, is on process authorities and scheduled processes.
4. Never process a recycled commercial jar with a reused one-piece cap. That combination has no tested process, and the used liner cannot be trusted to seal. Why reused commercial jars are a poor bet even for home use is on which jars can you can jam in?.

Plastisol liners and what "rated for" means

The sealing ring on the underside of a two-piece flat and the liner inside a lug cap do the same job: they soften with heat, conform to the glass rim, and hold the vacuum as the jar cools. Lug cap liners are commonly plastisol, and liners are made for different processes. A cap made for cold-fill products may not hold up in a boiling water canner or at hot-fill temperatures, which is why Penn State specifies gaskets made for hot water bath processing [3].

When you buy commercial caps, ask the supplier for the process the liner is rated for (hot fill, boiling water, retort) and the fill temperatures it tolerates, and match it to your approved process. Penn State's checklist applies to any closure: use new lids, check them for defects in the sealing surface and gasket, confirm the lid suits the jar, and do not over- or under-tighten [3]. A vacuum gauge on a sample of jars from each batch is the commercial way to confirm seals are consistent [3].

What buyers expect from the jar

Shop and cafe buyers rarely specify a jar type, but they notice three things:

• Clean, consistent glass. No sticky rims, no jam under the lid, the same fill level in every jar. A row of uneven jars on a shelf reads as homemade in the wrong way. Weighing fills, described on jar sizes and fill weights, fixes most of it.
• No rust and no exposed bands. Bands left on in storage can rust and hide a failed seal; University of Georgia guidance is to remove ring bands from sealed jars after cooling [2]. For retail, some makers sell with the band off and a label or shrink band over the lid; others put a clean band back on for appearance just before sale.
• Some sign the jar has not been opened. A concave lid is one sign, but it can be faked by resealing with a new flat. Whether to add a shrink band or seal label is on tamper-evident seals.

Label and fill do most of the work of making a jar look at home on a specialty shelf, and many successful small makers sell in plain canning jars.

Settle the process first, then the jar

If you are still in a cottage kitchen, start with what your state allows on selling jam from home under cottage food. If you are moving to a licensed kitchen and want commercial jars, read hot-fill-hold and commercial filling before you order a pallet of hex jars.

References

1. U.S. Department of Agriculture, Complete Guide to Home Canning, Guide 7: Preparing and Canning Jams and Jellies, revised July 2015 (NCHFP copy). https://nchfp.uga.edu/papers/guide/GUIDE07_HomeCan_rev0715.pdf
2. University of Georgia Cooperative Extension (E. L. Andress), publication FDNS-E-37-1 on making and canning jams and jellies, revised June 2011. https://openscholar.uga.edu/record/23661/files/FDNS-E-37-1.pdf
3. Penn State Extension (L. LaBorde), Food for Profit: Commercial Production of Jams, Jellies, and Fruit Butters, updated May 24, 2024. https://extension.psu.edu/food-for-profit-commercial-production-of-jams-jellies-and-fruit-butters
4. Washington State Register, WSR 16-06-014, amendments to WAC 16-149 (cottage food operations), including WAC 16-149-120(3), 2016. https://lawfilesext.leg.wa.gov/Law/WSR/2016/06/16-06-014.htm
5. Michigan Department of Agriculture and Rural Development, What Can I Make? (cottage food), not dated (viewed 2026). https://www.michigan.gov/mdard/food-dairy/cottage-food/what-can-i-make