One caveat about using closed plastic bags for storage. You can get
several undesirable effects even from archivally correct plastics. The
first being that the air inside the bag can be either warmer of colder
than the external air and if there is a significant enough difference
then condensation can occur with the bag - this can be prevented in
large measure by either opening the bag to let it acclimate before an
object is moved, or, you can use a material like soft tyvek that will
allow vapor and air exchange but will block liquid water from the
object wrapped inside of it. You also need to be extra careful of the
maerials within a bog that you will be closing as any outgoassing or
residual acids will have a much more significant effect in a closed
system  - a microclimate - then if the object were left in a box, for
example.

Cheers!
Dave

David Harvey
Conservator
Los Angeles, California

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