How Adhesive Seals Affect the Security of Padded Mailers
Peel-and-seal, self-seal, or gummed: which closure keeps your padded envelopes most secure.
Seal types
Quick answer
Peel-and-seal provides the strongest, most tamper-evident closure for padded envelopes. The adhesive creates a permanent bond that tears the envelope if opened, providing visible evidence of tampering. Self-seal is adequate for low-value items. Gummed seals are cheapest but can fail if insufficiently moistened. For e-commerce and valuable items, peel-and-seal is the standard.
Security comparison
Opening tears the envelope, showing clear evidence of interference.
The fold-over design is less resistant to deliberate opening.
Traditional gummed adhesive releases with heat and moisture.
More: seal comparison or quality guide.
Choosing the right seal
For business and e-commerce: peel-and-seal. For casual personal use: self-seal is adequate. Gummed is only appropriate for very low-value, non-sensitive mailings where cost is the primary concern.
Secure padded envelopes
Peel-and-seal padded envelopes for tamper-evident security from ProcuraPack.
Browse padded envelopesFrequently asked questions
Peel-and-seal provides the strongest bond and tamper evidence.
Not without visible damage, which is why they are considered tamper-evident.
For low-value items yes. For valuable goods, peel-and-seal is recommended.
No, the seal type does not change the envelope classification or postage cost.
You can, but quality peel-and-seal should not need it.
Part of our guide
Product Guide: Padded Envelopes
Expert guides on padded envelopes and cushioned mailers for safe, cost-effective shipping.
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