ZeonTools
What is Void Space in Shipping?
Void space is the empty air inside a corrugated shipping box that surrounds the actual product. Because e-commerce merchants usually stock a limited variety of standard box sizes (e.g., Small, Medium, Large), rigid items rarely fit perfectly within the bounding volume.
High void space requires the merchant to insert "void fill"—such as plastic bubble wrap, styrofoam peanuts, or crumpled kraft paper—to prevent the item from moving and sustaining damage during transit. This adds material costs, labor overhead, and generates massive, environmentally toxic plastic waste.
Multi-Bin Cartonization Algorithm
When an e-commerce order is too massive to fit into the largest available box in the warehouse, standard calculators fail. Our engine utilizes a Multi-Bin Cartonization Algorithm.
It recursively splits the shipment into multiple boxes, packing the largest items into the most optimal bounding volume first, and then routing the remaining overflow SKUs into subsequent optimal boxes. This generates a complete "Shipment Manifest" that warehouse workers can immediately use to pick and pack the order efficiently.
3D Spatial Rotation & Fragility Constraints
Basic volumetric calculators simply check if the total volume of the cart is less than the box's volume. This is mathematically flawed. You cannot melt a rigid laptop into a long mailing tube, even if the tube has a larger total volume.
Our engine uses an advanced 3D bounding-box heuristic, mathematically simulating rotating every item across all 6 spatial orientations (LWH, LHW, WLH, etc.). Furthermore, it supports Fragility Padding. If an item is marked fragile, the engine mathematically inflates its bounding box by 2 inches in all directions to guarantee physical room for protective bubble wrap.
Understanding Dimensional (DIM) Weight
In the past, shipping couriers like FedEx, UPS, and USPS charged purely based on actual physical weight. However, as e-commerce exploded, cargo planes were filling up with lightweight but massive boxes. The airlines were losing money because they ran out of physical volume before hitting weight limits.
Couriers introduced Dimensional Weight Pricing. They calculate the cubic volume of the box (L x W x H) and divide it by a standard divisor (usually 139 for domestic US shipments). The merchant is billed for whichever is greater: the Actual Weight or the calculated DIM Weight.
The Financial Penalty of Shipping Air
If you ship a 2 lb laptop in an unoptimized 24" x 18" x 12" box, the actual weight is 2 lbs. However, the DIM weight calculation is (24 x 18 x 12) / 139 = 37.2 lbs.
The courier will legally bill you for a 38 lb package! This discrepancy is known as the "DIM Penalty." Unoptimized e-commerce businesses bleed thousands of dollars a month in wasted logistics spend simply because their warehouse packers choose boxes that are too large.
Scope 3 Emissions & ESG Impact
Beyond shipping costs, using oversized boxes falls under a company's Scope 3 Carbon Emissions (Value Chain Emissions). Corrugated cardboard requires cutting down trees, massive water usage in paper mills, and chemical pulping processes (approximately 0.94 kg of CO2e per 1 kg of cardboard).
By right-sizing your packaging and leveraging multi-bin cartonization, you eliminate void space, slash your corrugated cardboard consumption, entirely remove the need for single-use plastic bubble wrap, and maximize the density of delivery trucks, reducing fuel burned per package delivered.