How to ship glass jars without breakage
Glass survives shipping when no jar can touch another jar, the box wall, or the ground through the box. That means three things: a cushioned cell around every jar, a partitioned inner box so jars can’t migrate, and a double box so the outer carton absorbs the drop before it reaches the jars. This calculator sizes all three from your jar dimensions.
Read the two weights
A well-protected glass shipment is bulky, so it is often billed on dimensional weight — the box’s volume divided by the carrier’s divisor — rather than actual weight. The tool shows both and tells you which one governs, so the protection you add doesn’t surprise you at invoice time. If dimensional weight dominates, the fix is a tighter box, not thinner cushion.
The rules that actually prevent breakage
- Two inches of clearance on all sides for heavy or heirloom glass; 1–1.5 in for standard jars.
- Rigid partitions between jars — corrugated dividers, not just paper.
- Double-box with cushion between the inner and outer carton.
- Fill voids so nothing shifts; a jar that can move is a jar that can break.
- Drop-test one real pack before a production run.
Questions
How do you ship glass jars without them breaking?
Give every jar a cushioned cell, separate jars with rigid partitions so they can’t touch, and double-box so the outer carton takes the impact first. Aim for 1–2 inches of cushion on all sides, fill all voids, and drop-test one real pack before shipping a batch.
Do I really need to double box glass?
For anything fragile or valuable, yes. A single box transfers a drop straight to the contents; a double box lets the outer carton crush and absorb energy before it reaches the jars. The calculator sizes the inner and outer box for you.
How much cushioning do glass jars need?
One to two inches on every side. Use the lighter amount for standard jars and the full two inches for heavy, thin-walled, or irreplaceable glass. The cushion must be firm enough not to bottom out on impact — loose paper compresses to nothing.
Will double-boxing make my shipping more expensive?
It can, because carriers bill the greater of actual and dimensional weight and a protective pack is bulky. The tool shows both weights so you can see whether size or weight governs, and tighten the box rather than the cushion if dimensional weight is the problem.
What is the best box for shipping glass jars?
A sturdy single- or double-wall corrugated inner box with rigid partitions, inside a second corrugated outer box one size larger. Avoid oversized boxes with lots of loose fill — a snug, partitioned, double-boxed pack beats a big box full of peanuts.
Ship glass that arrives whole.
We design partitioned, right-sized corrugated for fragile goods — protection and freight cost balanced, not guessed.