When packing a museum collection recently for temporary storage we found it was very helpful to make up rolls of clean polythene bubblewrap and wrap them in acid-free tissue. We even created bubble wrap pillows in the museum (which meant we could control the quality of the air in the bubbles) by hiring an airpillow inflating machine and some rolls of different size bubble wrap. You can buy smaller versions of this e.g. http://www.davpack.co.uk/protective-packaging/air-cushion-system/air-cushion-machine.htm?gclid=CK2ogM3e1r8CFeTItAodyzAADQ
That way we had very light, inert packaging to fill up voids without risking crushing (from the weight) or scraping ((sharp edges of crumpled paper) the objects. Paper, being cellulose, is very heavy for its volume.
Another alternative would be to use spacers of Ethafoam or Plastazote.
Hope this helps.