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This self-adhesive confidential envelope offers a practical solution for sending private letters, legal documents, or any internal correspondence where proof of tampering is required. Its anti-opening design provides a clear, visual indication if the seal has been compromised, giving you and your recipient confidence in the integrity of your posted items. Constructed from a standard 80 gsm envelope cartridge paper and supplied in a single piece, it combines essential security features with straightforward usability for office or personal use.
This section details the specific attributes and build quality of the security envelope, based on the provided specifications.
Understanding where and how this product is most effectively used helps in making an informed purchase decision.
The practical advantages of this product are rooted in its specific design features and construction.





Self-adhesive confidential security envelope blue 105 x 240 mm anti-opening tamper-evident packaging mailer for private letters and legal documents, made from 80 gsm envelope cartridge paper, single piece supplied
£10.58
Sale price
£10.58
Regular price
Blue Anti-Opening Confidential Envelope for Secure Document Posting 105 x 240 mm

Features and Construction

Material and Build
The envelope is made from 80 gsm envelope cartridge paper. This weight of paper provides sufficient substance to protect the contents from minor damage during handling and posting, while remaining lightweight enough to keep postage costs down. The material choice represents a standard, functional grade for business stationery, prioritising practicality and cost-effectiveness for regular use.Size and Practical Fit
With dimensions of 105 mm in width and 240 mm in length, this envelope is sized to accommodate many common document formats such as A4 papers folded into thirds, smaller certificates, or multiple sheets of letter-sized paper. This makes it a versatile choice for a range of postal needs, from formal contracts to personal confidential letters, without being overly bulky.Uses and Placement

Event or Professional Use
In professional environments, this envelope is suitable for dispatching sensitive information such as client contracts, personnel records, financial summaries, or tender documents. The tamper-evident feature is particularly valuable for legal and financial sectors, or any business where proof of an unbroken chain of custody for paperwork is important. The blue colour can also aid in internal mail sorting or categorisation.Everyday Home Use
For personal use, it provides security for posting important personal documents like copies of identification, bank details, private correspondence, or official forms. The self-adhesive flap removes the need for a separate moistener, making the sealing process cleaner and more convenient for occasional users at home.Benefits and Buying Value

Reuse and Low Maintenance
As a single-use item designed for posting, its primary value is in the secure transit it provides. There is no maintenance required; its function is fulfilled upon successful delivery. The design inherently discourages reuse, which is a key aspect of its tamper-evident security promise.Why Choose This Product
You would choose this product when you need a basic yet effective level of security for posted documents. The combination of the tamper-evident feature, the convenient self-adhesive seal, and the practical 105 x 240 mm size in a recognisable blue colour addresses the core need for confidential posting without unnecessary complexity or cost. It is a functional, single-purpose solution.




