Packing design and packaging can also be designed
to minimize water loss. To minimize condensation
inside the bag and reduce the risk of microbial growth,
the bags may be vented, microperforated, or made of
material permeable to water vapor. Barriers to water
loss may also function as barriers to cooling, and packing
systems should be carefully selected for the specific
application with this in mind. Packaging materials,
storage or transport containers, or bins that contain synthetic
fungicides, preservatives, or fumigants (or any
bag or container that has previously been in contact
with any prohibited substance) are not allowed for
organic postharvest handling. In small-scale handling,
the reuse of corrugated containers from conventional
produce is strongly discouraged by organic certifying
organizations. Reuse of hard-to-clean containers that
held conventional produce may even be prohibited by
specific organic registration or certifying authorities.