Hardboard vs Kraft-Backed Do Not Bend Envelopes: Which Is Better?
Hardboard or kraft-backed? Which board type protects your documents best.
Key differences
Quick answer
Hardboard-backed for maximum rigidity on high-value prints and certificates. Kraft-backed for everyday documents and cost-sensitive applications. Hardboard provides superior bend resistance but weighs more and costs more per unit. Kraft-backed envelopes offer good rigidity at lower weight, keeping postage costs down. For most business documents, kraft-backed is sufficient. For artwork and photography, hardboard is the safer choice.
Rigidity comparison
Dense board resists bending under pressure better than any alternative.
Documents, certificates, and standard prints are well protected by kraft.
A 600gsm kraft back can match a lighter hardboard insert for rigidity.
High-GSM kraft backing provides excellent bend resistance for most applications.
Material detail: GSM guide or bend resistance.
Cost and weight
Hardboard-backed envelopes cost 20-40% more per unit and weigh more, which increases postage on weight-sensitive pricing. Kraft-backed are lighter and cheaper but with slightly less rigidity. Calculate the total cost including postage, not just the envelope unit price.
Which to choose
Both types available
Hardboard and kraft-backed do not bend envelopes from ProcuraPack.
Browse do not bend envelopesFrequently asked questions
Hardboard offers maximum rigidity. High-GSM kraft provides good rigidity at lower weight.
Kraft-backed, typically 20-40% less per unit than hardboard-backed.
Kraft-backed, which also means lower postage on weight-based pricing.
Yes, both hardboard and kraft constructions are recyclable.
For high-value artwork, photography prints, and irreplaceable documents.
Part of our guide
Product Guide: Do Not Bend Envelopes
Expert guides on rigid mailers and board-backed envelopes for protecting documents, prints, and certificates.
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