Hi Leisha,
we trim and then supply our mushrooms in trays lined with brown paper Kraft bags on the top and bottom:

Spraying the paper a little helps keep them fresh in the fridge for 3-6 days depending on the strain and point at which you harvest.
If taking to farmers markets you may be better off doing them in individual punnets.
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This reply was modified 9 years, 10 months ago by
Adam.