I've tried searching the web, this group, and various home canning
websites for info or advice about shipping FILLED jars of home canned
goods. But the only things I find are jars for sale, and the shipping
and handling costs of that.

I'm planning to mail some half-pints of zucchini relish to relatives.
I know to write "FRAGILE - GLASS" on the outside and use enough
padding to keep the jars safe. Probably leaving the rings on will keep
the lids from coming off. But does it cause problems if the jars are
laid on their side during transit? I doubt that writing "THIS SIDE UP"
will guarantee that really stay that way during shipping.

Have you ever shipped juicy items like this? Got any tips to share?

Thanks!