Shipping costs are calculated two ways: actual weight and dimensional weight. Most carriers bill on whichever is higher, which means a lightweight box that takes up a lot of space can cost as much to ship as a heavy one. For operations that ship bulky but light products, dimensional weight is often the larger cost, and packaging material choice is one of the few levers that affects it.
The relationship is straightforward. Dimensional weight is calculated from the box's length, width, and height. Reducing any of those dimensions reduces the chargeable weight. The challenge is that reducing box size usually means reducing the space available for cushioning, which puts protection at risk. The way to solve both problems at once is to use a cushioning material that protects effectively in less volume.
This is where material behavior matters. Air-based materials protect by trapping air, which means they need volume to work. A box cushioned with air pillows needs enough empty space for the pillows to sit between the product and the box wall, and that empty space is what the carrier charges for. Foam materials are denser and protect in less volume, but they require custom shapes for irregular products, and the tooling cost makes them impractical for mixed orders. Loose fill materials like foam peanuts protect by displacement, which also requires volume and tends to settle during transit, reducing protection and creating voids that need topping up.
Paper-based cushioning behaves differently in a way that matters for dimensional weight. A material that conforms to the product surface rather than sitting beside it uses less empty space for the same level of protection. The cushioning layer is thin and follows the item's shape, so the box can be sized closer to the product rather than to the product plus a buffer of air. For irregular items, this difference can be substantial, because the empty space around an irregular shape is exactly where dimensional weight accumulates.
There is a second effect worth noting. Materials that settle or compress during transit require the packer to leave extra margin, because the protection degrades as the material moves. Materials that hold their structure allow the packer to size the box more precisely, because the protection level at packing is the protection level on arrival. That precision is where the dimensional weight saving comes from, more than from any single material being thinner.
For operations exploring this, the relevant question is which materials hold their structure under load and conform to the product. Aircosan's kraft honeycomb paper roll is one example in this category. It is made from virgin kraft paper pressed into a 3D honeycomb structure, and it is zero-plastic, 100% recyclable, and biodegradable, with FSC certification. It comes in 70g and 80g, widths of 300mm, 380mm, and 500mm, and roll lengths from 20m to 250m, with an expansion ratio of 1:7 and an average tensile strength of 13.86N. Each roll carries a batch number engraved inside for traceability. Used with the electric honeycomb paper dispenser, it expands and cuts automatically at up to 25m/min, runs on 110V or 220V, and comes in an H30 standard model and an H30 cutter model with foot control available.
The honest trade-off is the same one that applies to any paper switch. Honeycomb paper costs more per roll than plastic foam, and pressed paper requires a stretching step that plastic does not. Whether the dimensional weight saving outweighs that depends on the product mix and the carrier rates. For operations shipping bulky but light products, the saving is often larger than the material cost difference. For operations shipping dense items, dimensional weight is less of a factor and the calculation changes.
The practical approach is to measure the current box dimensions and chargeable weight for a sample of orders, then test whether a smaller box with conforming cushioning maintains protection. Most operations find that they have been sizing boxes for the cushioning material rather than for the product, and that changing the material allows a smaller box without reducing protection. The saving shows up on the carrier invoice, which is the number that matters most in this calculation.