Last Mountain (based out of Saskatchewan, Canada) does exactly this - all of their jams come in 1L mason jars. Downside is that the label on the jar is hella f

Last Mountain (based out of Saskatchewan, Canada) does exactly this - all of their jams come in 1L mason jars. Downside is that the label on the jar is hella frustrating to remove. The glue isn’t exactly water soluble.