In reply to Pete Houghton:
I don't think anyone is doing anything vastly different, different combos of foil, insulated cas bags, heaters etc... there are obvious limitations on what can be used, light enough to carry in, full length zips, access for pulse ox or drip line..., some width flex for splinting and larger cases, a big hood, all need to be compressable for stretcher straps to hold them securely etc. There has even have been the odd dabble with bubble wrap! Doesn't harm to ask around though. If you want to look at the lightest, most creative and flexible systems do a joint training exercise with cave rescue.
Post edited at 07:32