Tamper evident envelopes


Keepsafe, a range of sturdy, single use, tamper evident security envelopes.  They are also known as security tamper evident bags (STEBS) and typically used for transporting valuable or sensitive goods or documents.


  • Available in white opaque or clear polythene. 
  • Weatherproof, waterproof, burst tear and puncture resistant. 
  • Double peel & seal, tamper evident enclosure.
  • Sequentially numbered with matching tear off receipt tab.
  • Write on surface.
  • Recyclable.


  • Suitable for traditional and new airport security applications. 
  • Strong and durable protection.
  • Quick visual integrity check.
  • Unique serial number for easy identification and verification.
  • Accepts handwriting, stamps and franking.
  • Environmentally friendly.
 Tamper evident security envelopes


  Code.   Colour.   Internal size (mm).

KS01      Opaque     160mm x 260mm     
KS02      Opaque     225mm x 305mm     
KS03      Opaque     340mm x 430mm     

KS01C    Clear        160mm x 260mm     
KS02C    Clear        225mm x 305mm     
KS03C    Clear        340mm x 430mm     


  • Banks.
  • Security services.
  • legal.
  • Police/ Prisons.
  • Casino's.
  • Airport security.
  • Councils etc.
Tamper evident envelopes



Need a customised version ?? Contact us now. Perhaps you are looking for a reusable security envelope or bag ??

polythene security envelopes

Tamperevidence.com – simple security solutions.

As we have no control over the application and conditions our products are used in. we maintain it is the responsibility of the end user to determine that this is the correct product to suit your requirements. To that end we offer free samples and telephone guidance, please do not hesitate to contact us if you need help.