If you sell into the EU, your packaging is about to be judged by a number you’ve probably never had to think about before: the void ratio. New European packaging waste regulation is capping empty space inside packaging at 40% by 2026, and it’s already reshaping how brands think about box design.
Here’s what that means and why collapsible rigid boxes are positioned well for it.
What the void ratio rule actually targets
Empty space inside a box isn’t free. It means more material used to ship less product, more volume taking up space in trucks and warehouses, and more packaging waste relative to what’s actually being delivered. The new EU rule sets a ceiling on how much of a package’s interior can be empty air — 40% — pushing brands toward packaging that’s sized closer to the product it holds.
For a lot of brands, this means rethinking boxes that were oversized out of habit, or built with generic dimensions that didn’t quite fit the product inside. It’s a design constraint now, not just a cost-efficiency nice-to-have.
Why this is driving demand for space-efficient formats
Compliance pressure is one of the factors behind the growing demand for collapsible rigid containers — packaging that gives you the strength and premium presentation of rigid board without the wasted volume of an oversized, pre-assembled box. The market for collapsible rigid containers is projected to grow from roughly $2.17 billion in 2025 to $3.66 billion by 2035, and regulatory pressure like PPWR is a real part of that growth story, not just changing consumer taste.
How collapsible design helps with void ratio compliance
Collapsible rigid boxes aren’t automatically compliant just by being collapsible — the void ratio rule is about how much empty space exists once the box is packed with product, not about how the box ships flat to you. But the format gives you a practical advantage: because collapsible boxes are engineered around a specific product fit, and because the format is popular for closer-to-size builds, brands using them are often already closer to the leaner dimensions the regulation wants than brands using generic, oversized stock boxes. See our comparison of collapsible vs standard rigid boxes for how the two formats differ on cost and fit.
If you’re redesigning packaging with PPWR in mind, the real work is sizing the box to the product — closely, not just closely enough. Collapsible construction makes that resizing less costly than it would be with pre-assembled rigid stock, since you’re not paying to ship and store the wasted volume of a box that turns out to be the wrong size.
The storage and shipping upside stacks with the compliance angle
This isn’t purely a regulatory story. Collapsible rigid boxes ship flat, which means more boxes fit in the same container or truck — some formats cut shipping costs by up to 40% compared to pre-assembled rigid equivalents. For a brand shipping into the EU from overseas, that efficiency gain and the compliance pressure point in the same direction: smaller, tighter, less wasteful packaging.
What to check if you sell into the EU
- Measure your current void ratio — how much of your packaged box is actually empty space around the product
- Ask whether a closer-fitting box size is realistic for your product without compromising protection
- Consider whether collapsible rigid construction gets you a tighter fit without giving up the premium unboxing feel
- Talk to your supplier about compliance directly — regulations like this tend to tighten further, and it’s easier to build packaging that has room to adjust than to redesign from scratch every time the rule changes
Europe has generally led on sustainable packaging adoption, and PPWR is part of that pattern continuing. Brands that treat this as a design opportunity — leaner boxes, less wasted material, lower shipping cost — tend to come out ahead of brands that treat it as a compliance headache to deal with later. Talk to our team if you’re resizing packaging for the EU market.
Related Reading
- Collapsible Rigid Boxes vs Standard Rigid Boxes: Shipping & Storage Cost Comparison
- Sustainable Packaging Materials Guide 2026
- Benefits of Using Collapsible Rigid Boxes
Frequently Asked Questions
What is the PPWR void ratio rule?
It’s an EU packaging regulation that caps the amount of empty space inside a package at 40% by 2026, pushing brands toward packaging sized closer to the product it holds.
Are collapsible rigid boxes automatically PPWR-compliant?
Not automatically — compliance depends on how closely the packed box fits the product, not on whether the box format is collapsible. Collapsible construction just makes it more practical to build a closer-fitting box without the cost penalty of pre-assembled rigid stock.
Does resizing packaging for PPWR also save money?
Usually, yes. A tighter-fitting box uses less material and takes up less space in shipping, which tends to lower both material and freight costs alongside meeting the compliance requirement.