It's not light at all the packing you're right and must be 20x heavier or more than the little bottle that is very light only a few hundred grams!Wow! I can only assume it helps in some way, maybe automated parcel handling ? I've had parcels with that shredded cardboard filler, it's not light.
In france when you buy 4 kebabs you get 4 metal skewers with them rather than the wooden cocktail sticks you get hereI have had similar very recently but don’t have the pic anymore, but a box that would have taken 1000 sheets of A4 paper contain a pack of 6 meat skewers- carefully wrapped in 8foot of brown paper !
ah - found the pic
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