Packaging Insert Thickness: How Much Protection Do You Need?
Too thin = product rattles. Too thick = wasted space and cost. Find the right insert thickness for your product. Chengtop Packaging’s thickness guide.
- Compare insert thickness levels
- Know which thickness protects what
- Match thickness to your product
- Understand material density
- Learn about cavity depth
- Avoid common thickness mistakes
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Description
Thickness Is Protection
The insert’s job is to hold your product securely. Too thin and it shifts. Too thick and you waste box space and money.
Thickness Levels
|
Thickness
|
Protection Level
|
Best For
|
|
2–3mm
|
Light
|
Light items, cards, flat products
|
|
5mm
|
Medium
|
Most products, cosmetics, small goods
|
|
10mm
|
High
|
Fragile items, bottles, electronics
|
|
15mm+
|
Maximum
|
Heavy, very fragile, high-value items
|
By Product Type
|
Product
|
Recommended Thickness
|
|
Cosmetic bottle
|
5–10mm
|
|
Glass bottle
|
10–15mm
|
|
Phone / electronics
|
5–10mm
|
|
Jewelry
|
3–5mm
|
|
Food / jar
|
5–10mm
|
|
Heavy tool
|
15mm+
|
Material Density Matters
Thickness alone isn’t enough. Material density also matters:
|
Material
|
Density
|
Protection
|
|
EVA foam
|
Medium-high
|
Good, cushioning
|
|
PU foam
|
Medium
|
Soft, good for delicate items
|
|
Molded pulp
|
Medium
|
Eco, structural
|
|
Cardboard insert
|
Low-medium
|
Light protection
|
Cavity Depth
The cavity should:
- Fit your product snugly
- Hold it just below the surface
- Allow easy removal
- Not be so deep that product falls out
Rule: Cavity depth = product height minus 1–2mm.
The Balance
|
Too Thin
|
Just Right
|
Too Thick
|
|
Product rattles
|
Snug fit
|
Wasted space
|
|
Poor protection
|
Secure
|
Higher cost
|
|
Looks cheap
|
Premium look
|
Heavy box
|
How to Choose
- Weigh your product — Heavier = thicker insert
- Check fragility — Glass/ceramic = more protection
- Measure product height — Cavity must match
- Consider shipping distance — Long shipping = more cushioning
- Test before bulk — Drop test a sample
Common Thickness Mistakes
- Too thin for fragile items — Product breaks in transit
- Too thick for light items — Wastes material and cost
- Cavity too deep — Product falls out or rattles
- Ignoring material density — Thin dense foam can beat thick soft foam
- No drop test — Always test a sample before bulk order
Ready to Choose Your Insert Thickness?
Tell us your product type and fragility — we’ll recommend the right thickness and material.
Email: chengtop888@outlook.com
WhatsApp / Phone: +86 15272060604
