This invention relates to packaging materials comprising a water-impermeable outer layer bonded to a water-absorbent layer and having an inner layer that is water vapour-permeable, and to processes for the manufacture thereof. The invention also provides for the storage and/or transport of perishable goods, and in particular for the storage and transport of horticultural produce such as fruit, vegetables and cut flowers. The present invention also provides a method of regulating the O.sub.2 content in the environment surrounding packaged perishable goods.