Inflatable shipping bags

We have heard that there is a shipping bag, rather like a Jiffy bag,
but with an inflatable inner plastic sac.  The idea is to inflate
the inner bag as much as needed, to provide a protective cushion of
air which molds itself around the item in the bag.  Can anyone give
me a supplier for these?  Does anyone have any experience using
them--good or bad?  Are they reusable?  Many thanks,

Alison Bullock
Preservation Librarian
National Library of Canada
395 Wellington Street
Ottawa Ontario K1A 0N4
Canada
613-992-9652

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                  Conservation DistList Instance 9:30
                Distributed: Friday, September 29, 1995
                        Message Id: cdl-9-30-009
                                  ***