• Brown cardboard envelopes with locking flaps - 1
  • Brown cardboard envelopes with locking flaps - 2
Brown cardboard envelopes with locking flaps - 1
Brown cardboard envelopes with locking flaps - 2

Brown cardboard envelopes with locking flaps

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  • 350 gsm micro-flute corrugated board
  • Keeps items free from creasing during posting
  • Reinforced corners also provide extra protection
  • Expandable edges increase height up to 40 mm
  • Sold in packs
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Find this product on page(s) 100 of the general catalogue
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Detailed description

Expandable and tamper evident for secure mailing


These brown, carton envelopes feature tamper evident locking flaps, which once inserted cannot be opened without causing considerable damage to the cardboard envelope. For extra security, double seal the envelopes with one of our packaging tapes. Each mailer is manufactured from 350 gsm micro-flute corrugated board which helps maintain the structure and rigidity of the envelope.

This board keeps your products flat and free from creasing during posting and will protect from day to day wear and tear. Reinforced corners also provide extra protection for your products.

The expandable edges allow the cardboard envelope to increase in height by up to 40 mm, meaning that you can use these cardboard envelopes to post a variety of different products including, DVDs, CDs, books, catalogues and calendars.

Recycled_60_en_GB Recyclable_en_GB

Our product advice

How to choose the correct size brown cardboard envelope for your product:When the cardboard envelope is expanded, please note that envelope decreases in opening and length measurements.To use at minimum capacity: Subtract 20 mm from the opening and 10 mm from the length.To use at maximum capacity: Subtract 60 mm from the opening and 30 mm from the length.