Anything placed in a load to keep it from shifting: inflatable bags between pallets, board, foam, air pillows, blocking and bracing. Good dunnage is often cheaper than the damage it prevents, and reducing void space usually reduces the dunnage needed in the first place.
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How can packaging reduce warehouse space?
Most warehouses lose space in the same four places, and packaging touches all of them.
TermTertiary packaging
The transport layer: pallets, stretch film, edge protection, dunnage.
TermSlip sheet
A thin sheet used in place of a pallet, moved with a push-pull attachment.
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CAQUIN sources industrial packaging to specification. Send what you use today, roughly how much, and where it ships — a photo is enough to start.