Security Bags

Security bags, envelopes and pouches provide visible tamper evidence for handling cash and valuables, confidential documents, forensic exhibits and healthcare samples. Our range includes single-use security envelopes (AKA tamper evident mailers) and reusable security pouches and bags for closed-loop applications such as controlled internal distribution. Popular sizes include A5–A3, with the option of fully bespoke designs. Tamper-evident bags and envelopes help reduce risk when transporting valuable or sensitive items, providing a clear deterrent to theft or interference. Trusted across logistics, healthcare, retail, banking and the public sector.

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Sub-Categories

Image of Single-Use Tamper Evident Bags

Single-Use Tamper Evident Bags

Image of Reusable Security Bags

Reusable Security Bags

Image of UN3373 Specimen Bags

UN3373 Specimen Bags

Security Bags range

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White opaque security bags A5 and A4 clear security bags
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Tamper Evident Security Bags. A5/A4/A3

From £22.00
Tamper Evident Security Bags for A5, A4 & A3 Items. 80% Recycled Content
White A4 security bags Clear A4 security bags
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C4 / A4 Mail Security Bags, Pk-100pcs

From £29.00
A4 Single-Use Tamper-evident Security Bags for Secure Mail, Evidence & Valuables. 100pcs per pack
Customised Tamper-evident Security Bags Customised Tamper-evident Security Bags different options
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Customised Tamper-evident Security Bags

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Fully customised single-trip security bags for secure transport of confidential items. 80% recycled plastic option (PCR).
Picture of B5 / A5 Mail Security Bags (180x260mm) Picture of B5 / A5 Mail Security Bags (180x260mm)
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B5 / A5 Mail Security Bags (180x260mm)

From £22.00
A5 Single-Use Tamper-evident Security Bags for Secure Mail, Evidence & Valuables
Picture of B4 / A4 Mail Security Bags (255x360mm) Picture of B4 / A4 Mail Security Bags (255x360mm)
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B4 / A4 Mail Security Bags (255x360mm)

From £29.00
A4 Single-Use Tamper-evident Security Bags for Secure Mail, Evidence & Valuables
Picture of C3 / A3 Mail Security Bags (330x475mm) Picture of C3 / A3 Mail Security Bags (330x475mm)
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C3 / A3 Mail Security Bags (330x475mm)

From £33.00
A3 Single-Use Mail Security bags with tamper seal for bulkier items and parcels
STEB Bags Picture of STEB Bags (Duty Free Security Bags)
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STEB Bags (Duty Free Security Bags)

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STEB duty free security bags with tamper-evident closure, ICAO compliant.
Cash Bags in 3 sizes Choice of colours
MADE TO ORDER

Re-usable, Tamper-evident Cash Bags

From £65.00
Tamper-evident money bags for reliable cash-in-transit, valuables and retail use
Re-usable & Secure Key Wallets Re-usable & Secure Key Wallets 2 colour options
MADE TO ORDER

Re-usable & Secure Key Wallets

From £55.00
Secure tamper-evident key wallets for controlled keyholding
Re-usable Internal Mail Pouches colour-coded Re-usable Internal Mail Pouches
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Re-usable Internal Mail Pouches

From £55.00
Colour-coded, internal mail pouches for movements and handling
Security mail pouches Mail pouch colours
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Flat Security Mail Pouch (Long-edge zip)

From £39.50
Durable reusable mailing pouch for secure transport of sensitive mail and documents. Closure across long edge.
Security Mail Pouch Security Mail Pouch colour options
MADE TO ORDER

Flat Security Mail Pouch (Short-edge zip)

From £35.00
Low-cost secure mailing for smaller mail items and documents. Zip closure across short edge.
Security Mailing Pouches (Full Gusset) Security Mailing Pouches (Full Gusset) colours
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Security Mailing Pouches (Full Gusset)

From £65.00
Reusable and secure mailing pouches for bulkier items and documents, with full-gusset
Security Mailing Pouches (Bottom Gusset) Security Mailing Pouch yellow(Bottom Gusset)
MADE TO ORDER

Security Mailing Pouches (Bottom Gusset)

From £60.00
Secure mailing pouches for heavy documents, with bottom gusset
Tamper-evident Security Holdalls Tamper-evident Security Holdalls colours
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Tamper-evident Security Holdalls

From £100.00
Reusable security holdalls for tamper-evident bulk transport of valuables, documents & equipment.
Button seals for security pouches Button seals with numbers
MADE TO ORDER

Button Seals for Security Pouches

From £34.00
Button seals for securing cash bags & mailing pouches. Standard or customised.
Medical Pharmacy bags with and without handles Medical pharmacy bag without handles
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Medical Pharmacy Bags

From £37.50
Tamper-evident padded pharmacy bag for secure transfer of prescriptions between wards and departments.
cytotoxic drug bag Button Seals
MADE TO ORDER

Secure Cytotoxic Drug Bags

From £33.00
Reusable tamper-evident cytotoxic bags for controlled handling of toxic or hazardous drugs
Temperature controlled insulated specimen bag UN3373 compliant specimen bag

SecureLab COOL - Insulated Sample Transport Bag

From £175.00
Insulated medical carrier for transporting diagnostic and biological samples under UN3373 regulations.
Insulated Medical Carrier Insulated Medical Carrier - various colours
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MADE TO ORDER

SecureLab CHILL - Insulated Medical Carrier

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UN3373 rugged and insulated medical carrier for laboratory specimen transport
Heavy-duty woven polypropylene security sack with sealing eyelets Heavy-duty Woven Security Sacks with plastic security seals
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Heavy-duty Woven PP Security Sacks

From £19.50
Strong heavy-duty sacks in durable woven PP material, with eyelets for security sealing. 50KG weight
ADR Specimen Bags for Transport by Road Specimen Bags for Transport by Road UN3373
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SecureLab 95 - ADR Specimen Bags for Transport by Road

From £21.00
95kPa Medical Specimen Bags for Transport of Infectious Substances by Road. UN3373 Compliant.
Specimen Bags for Transport by Air with absorbent pads Specimen Bags for Transport by Air with absorbent pads
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SecureLab 95 - IATA Specimen Bags for Transport by Air

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Medical Specimen Bags suitable for transport by air under IATA Regs. Compliant with UN3373 & PI650 Requirements.
Biohazard Bags with Document Pouch Biohazard Bags with Document Pouch

SecureLab Biohazard Bags with Document Pouch, 152x140mm

From £42.00
Specimen Bags for transport of blood, urine & stool samples to pathology laboratories

Single-Use vs Reusable Bags

Single-use security envelopes and tamper-evident bags are best suited to one-way movements such as post, courier and external transfers, where a sealed pack is issued once and then removed from use. For sustainability requirements, many single-use options can be supplied with bag film containing at least 80% post-consumer recycled (PCR) content. Reusable options are typically chosen for closed-loop routes—such as internal logistics, cash handling and controlled distribution—where repeat handling, durability and colour coding are important. This includes PVC security pouches and carriers, as well as sturdier woven PP security sacks for higher-capacity or more demanding applications, usually secured with a disposable tamper-evident seal.

 

UN3373 Bags: What’s Different?

UN3373 specimen transport packaging is used for Category B biological substances and follows a more specific packing format than standard security envelopes or cash bags. While standard security bags focus on tamper evidence and traceability, UN3373 workflows often require components such as 95kPa specimen bags, absorbent materials and compliant outer packaging with the correct labelling. If you’re transporting diagnostic samples, view our UN3373 specimen bags and accessories to build the right pack format.

 

Frequently Asked Questions

What are security bags? Are they the same as tamper-evident bags?

“Security bags” is a broad term for bags used to protect items in transit or storage. “Tamper-evident bags” are security bags specifically designed to reveal interference. You may also see them described as tamper evident bags or tamperproof bags in search terms. Tamper-evident bags are used to protect cash, confidential documents, medical items or evidence in transit or storage. They are designed to show clear signs of interference (for example a VOID message or a numbered seal), include unqiue numbering or barcodes to support traceability, and available as fully customised bags.

What is a security envelope?

A security envelope is a tamper-evident envelope or mailer used to send documents or small items where visible evidence of opening is required. Common formats include single-use security envelopes (often called deposit envelopes or tamper evident mailers).

What is the difference between standard envelopes and security envelopes?

Standard envelopes are intended for general mailing. Security envelopes use tamper-evident closures and more robust materials so attempted opening is easier to detect during handling and transit.

What are security bags used for?

Security bags are used wherever items need to be transported or stored with visible tamper evidence and (often) traceability. Common uses include cash and valuables handling (deposit processes and cash-in-transit), confidential documents (secure internal mail and courier transfers), healthcare logistics (sealed movement of records, medicines or samples within controlled workflows) and evidence handling (forensic exhibits where identification and chain-of-custody processes are important).