Tamper Evident Bags UK Guide to Secure Packaging
5 September 2026
A parcel leaves a pharmacy, passes through a warehouse, reaches a courier and finally arrives at a shop counter. Everyone involved assumes the contents are intact, but nobody can prove whether the bag was opened between handovers. A tamper evident bag changes that conversation. Instead of relying only on trust, the recipient can inspect the closure, check the identifier and see whether the package shows signs of interference.
That practical reassurance matters across UK healthcare, cash handling, evidence management, aviation, logistics and food delivery. It also matters to procurement teams that need a packaging format people can use consistently, record accurately and explain during an audit.
Table of Contents
- Introduction to Tamper Evident Bags in the UK
- How Tamper Evident Bags Work and Why They Matter
- Key Features and Closure Types Explained
- UK Regulations Security Testing and Compliance
- Industry Applications and Real World Use Cases
- Specification Checklist for Choosing the Right Bag
- Sourcing Printing and Bespoke Options in the UK
Introduction to Tamper Evident Bags in the UK
A secure bag doesn't need to make opening impossible. Its job is to make unauthorised opening visible and difficult to conceal. That distinction helps a receiving clerk, pharmacist, investigator or customer decide whether the contents arrived in the same condition as when they were sealed.
In the UK, tamper evidence has a particularly important role in regulated supply chains. The UK medicines safety-feature guidance explains that the Human Medicines Regulations 2012 require anti-tampering protection for most prescription medicine packs supplied to patients. The UK medicines safety-feature regime came into force on 9 February 2019, while post-Brexit guidance for Great Britain says the EU falsified-medicines safety-feature system no longer applies. The Medicines and Healthcare products Regulatory Agency still encourages companies to retain tamper-evident devices.
The need extends beyond medicines. UK Visas and Immigration guidance says staff must use a tamper-evident bag for property taken during investigations unless doing so is impossible. In food delivery, a 2024 GB consumer survey summarised by the UK Government found that 86% of adults believe food outlets should protect delivery food from tampering, while 49% want tamper-evident packaging. 84% would expect a product that guarantees food hadn't been tampered with, and 10% said they'd personally received tampered food deliveries. Among people aged 18 to 24, that figure was 24%.
This guide focuses on the decisions buyers face in practice: closure type, material, traceability, disposable or reusable formats, testing, compliance and bespoke printing. The central question isn't whether a bag has a security seal. It's whether the entire handover process makes interference apparent and responsibility clear.
How Tamper Evident Bags Work and Why They Matter
The easiest analogy is a wax seal on a letter. A recipient may not know who handled the envelope, but a broken seal provides a visible reason to stop and investigate. A modern security bag follows the same principle with engineered film, adhesive, printing and identification features.
A tamper-evident bag shows evidence after opening. A tamper-resistant bag makes interference harder but may not reveal it clearly. A tamper-proof claim suggests an absolute level of protection that ordinary packaging generally can't guarantee. For procurement purposes, focus on what the product can demonstrate, not on broad marketing language.
The three parts of a useful security process
One-time closure creates the first control. A permanent adhesive strip, tear-open construction or security seal should make ordinary resealing impractical. If someone opens the bag, the original closure shouldn't return to its original condition.
Visible indication creates the second control. A hidden VOID message, torn film, broken seal or exposed pattern gives the recipient something concrete to inspect. A strong bag that leaves no obvious sign after opening may protect the contents physically, but it offers weaker process assurance.
Unique identification creates the third control. Sequential numbers, barcodes or both allow a team to record which bag carried which item, who sealed it and who received it. The identifier turns a sealed package into a simple audit record.
Practical rule: A security bag protects a chain of custody only when staff record and check its identifying features.
The combination matters more than any single feature. A numbered bag without a reliable closure leaves a resealing risk. A visible seal without a record may show damage but won't identify where the handover failed. Together, closure, indication and identification deter casual interference and support a clear response when something looks wrong.
Key Features and Closure Types Explained
Buyers often begin with the seal, but the right choice depends on the handling environment. A courier delivery for prepared food has different requirements from a controlled medicine transfer or an evidence exhibit. Compare the closure, film, identification and disposal route as one system.
Closure options
Void tape uses a security adhesive that reveals a hidden VOID message or another visual change when peeled. It works well where the recipient needs an immediate, easy-to-understand indication. The message should remain legible under the expected storage and transport conditions.
Permanent peel-and-seal adhesive bonds the flap to the bag. Opening generally damages the closure or the bag itself, which makes it suitable for documents, samples and secure transfers. Specify the adhesive carefully, because the seal must stay closed during handling without making legitimate opening unnecessarily difficult.
Numbered ties or security seals add an identifier to the closure. They can support a strong audit trail, especially when staff record the number at dispatch and receipt. They don't replace a tamper-indicating mechanism, so check whether the seal visibly breaks or changes when removed.
A zipper lock can make a bag convenient to open and close, but convenience creates a potential resealing question. If the workflow requires a one-time closure, pair the zipper with a separate security seal and record the seal number.
Material and construction
UK-facing industry guidance identifies co-extruded polythene security bags as a common workhorse, often specified at 60 to 75 micron thickness for applications such as cash deposits, controlled transfers and evidence handling. The MSP Packaging guide to tamper-evident bags discusses the relationship between co-extruded film, durability, closure and security features.
Polythene remains useful where the bag needs flexibility, opacity, leak resistance or resilience during transit. Kraft paper offers a different customer experience and can suit food handoff, particularly where the bag is sealed after packing and the recipient needs an obvious indication before accepting the order. It isn't automatically suitable for every medical, liquid or evidential application.
| Closure Type | How Tampering Shows | Best For | Traceability |
|---|---|---|---|
| Void tape seal | Hidden message or visual pattern appears when the seal is disturbed | Customer handoff and general secure transit | Add printed numbering or a barcode where required |
| Permanent peel-and-seal | Adhesive or bag tears during opening | Documents, samples and controlled transfers | Record the bag reference if printed |
| Serial-numbered security seal | Seal breaks or changes when removed | Cash, evidence and accountable handovers | Strong when staff record numbers at each stage |
For a closer look at seal mechanisms and related options, see this guide to anti-tamper seals.
A short visual demonstration can help staff understand what to inspect during receipt:
UK Regulations Security Testing and Compliance
A procurement manager may buy a bag that looks secure, then discover that staff cannot verify it consistently or trace its route through the building. Compliance therefore has three parts: the legal requirements, any sector guidance, and your own documented controls. Ask what the package must demonstrate, who checks it, and which record proves the check took place.
For medicines, as covered in the introduction, the main task is to confirm that the proposed bag and closure fit the product, handling process and applicable specification. Keep the supplier's product information, agreed seal requirements, batch details and inspection instructions. The Human Medicines Regulations and falsified-medicines safety-feature guidance provides the relevant reference point. A buyer should verify that the tamper-evident feature cannot be bypassed during routine opening and that legitimate opening cannot be mistaken for interference.
Aviation uses a precise term. UK legislation defines a STEB as a security tamper-evident bag, and the relevant amendment regulations came into force on 1 June 2024, applying across England and Wales, Scotland and Northern Ireland. Buyers supplying aviation operations should use that formal terminology and confirm the applicable operational specification instead of treating STEB as a generic trade label.
What to request from a supplier
Test the points most likely to fail in your workflow:
- Seal performance: Check how the adhesive or closure behaves during expected storage and transport.
- Tamper visibility: Confirm that VOID markings, tears or broken seals remain clear to the receiving team.
- Leak resistance: Specify this for evidence, clinical materials and contents that could escape during handling.
- Identifier durability: Barcodes and sequential numbers should remain readable after ordinary contact, moisture exposure and transit.
- Opening procedure: Give staff a defined method so authorised opening is distinguishable from interference.
The NHSBSA Drug Tariff guidance defines sealed packets as tamper-evident when an easily detachable device prevents removal of contents without breaking the seal. For sterile products, an opened package should not be easy to reseal. This offers a practical healthcare procurement benchmark.
Choose disposable or reusable bags according to the chain of custody. Disposable bags leave the packaging with the recipient and create a clear one-way record. Reusable systems require controlled returns, cleaning or inspection, and a reliable record showing who had the bag at each stage. Paper may suit a dry, visible handoff, while plastic can offer greater flexibility, opacity and leak resistance. The material must match the risk, not just the appearance.
Retain the specification, batch information, test records and staff instructions. For suspected surveillance around a facility, TSCM bug sweep services in London may support, but never replace, physical packaging controls.
Industry Applications and Real World Use Cases
The same bag can look appropriate in a catalogue yet create problems in a live workflow. The deciding factor is usually the handover. Who seals it, who checks it, what gets recorded and what happens if the closure looks different?
Pharmacy and healthcare
A pharmacy or healthcare distributor may need opaque, durable film, a dependable one-time closure and clear identification. Staff can record the bag number against a consignment or internal transfer, while the recipient checks the seal before accepting the contents. Sterile or sensitive products demand particular care, because an opened package shouldn't be easily resealed.
Cash handling and retail deposits
Cash deposit bags are designed around accountability. A branch worker seals takings, records the identifier and transfers the bag to a collection or processing point. A reusable system may suit an established route with controlled returns, while disposable bags can provide a straightforward one-way record where the receiving team retains the packaging.
Evidence and investigations
Evidence handling places chain of custody at the centre. UKVI guidance requires tamper-evident bags for property taken during investigations unless that isn't possible. The government guidance also specifies that bags used for seized evidence must be barcoded and leak-proof, with sizes up to 0.675m x 0.9m for bulk seizures. These requirements are detailed in the police and forensic evidence bag guidance.
Food delivery and customer handoff
Food delivery creates a different expectation. The customer may never see the restaurant's internal packing process, so a paper-based bag with a clear tamper-evident tab can provide reassurance at the door. The UK consumer figures cited earlier show strong demand for visible protection, but paper isn't a universal substitute for polythene. Moisture, liquids, temperature and transit conditions may require a different construction.
Disposable or reusable
Disposable bags are often simpler for one-way movements. The original item stays inside the sealed package, and the receiving team can retain or destroy the bag according to policy. Reusable security bags can work where a controlled return loop exists, but the process must prevent old seals, labels or identifiers from creating confusion.
The bag is only one part of chain of custody. The handover record, inspection step and exception procedure complete the control.
Specification Checklist for Choosing the Right Bag
A good tender or supplier enquiry should describe the workflow before it describes the product. Use the following checklist to prevent a low-cost bag from creating extra work later.
- Define the contents: State whether the bag will carry medicines, evidence, cash, food, documents, samples or general goods. Contents determine opacity, leak resistance and material suitability.
- Set the dimensions: Specify the largest item, not the average item. Allow room for the closure without leaving excess space that makes packing and inspection awkward.
- Choose the film or paper: Co-extruded polythene can suit durable, opaque and secure transit applications. Kraft paper may suit a visible food-delivery handoff where the contents and conditions permit it.
- Select the closure: Decide whether you need VOID tape, permanent adhesive, a tear-open feature, a numbered seal or a combined construction. Ask how a legitimate recipient will recognise interference.
- Add traceability: Request sequential numbering, barcodes or both when staff need to match the bag to an order, exhibit, transfer or deposit.
- Confirm leak protection: Evidence, clinical materials and liquids require a clear answer on leak-proof performance. Don't assume a security seal makes the whole bag leak-proof.
- Plan the opening method: Staff should have a consistent way to inspect and open the package. A design that causes accidental damage can create avoidable exceptions.
- Review print and colour: Branding, handling instructions, warning text and department colours can make sorting easier, provided the print won't obscure the security feature.
- Check material claims: Ask whether the bag uses virgin or recycled polythene, and request clear information about disposal and recyclability rather than relying on broad environmental wording.
- Match volume to supply: Stock bags can suit immediate or variable demand. Bespoke production may make more sense when dimensions, numbering or print must match a documented process.
The final specification should include a sample approval stage. Test a filled bag through the actual packing, storage, transport and receipt routine before committing to a large production run.
Sourcing Printing and Bespoke Options in the UK
Stock bags are useful when the required size and closure already match the workflow. They reduce design decisions and can support urgent purchasing. Bespoke bags become more valuable when a business needs a particular size, branded instructions, department coding, integrated numbering or a material specification that standard stock doesn't provide.
A UK supplier should explain how it controls seal consistency, print registration, numbering sequence, barcode readability and batch quality. Ask for representative samples, production tolerances and a clear process for reporting a suspected defect. If the packaging enters a regulated environment, request the supporting technical documentation before placing the order.
Local manufacturing or UK-held stock can simplify communication and replenishment, but location alone doesn't prove suitability. Compare the supplier's production capability, sourcing arrangements, sustainable material options, minimum order requirements and distribution plan against your actual demand. A supplier with high-volume capacity may be able to support nationwide deliveries, while a smaller specialist may offer more personal design input.
MSP Packaging supplies stock and bespoke security bags for sectors including healthcare, pharmaceuticals, logistics, retail and e-commerce. Its bespoke security bag service can be considered when a standard bag doesn't provide the required combination of dimensions, print, material and chain-of-custody features.
The right choice follows a simple decision: use stock where the process is settled and the specification is standard; choose bespoke packaging where the bag itself must guide behaviour, identify responsibility or reinforce the customer experience. In both cases, approve samples against the workflow, not just a product photograph.
MSP Packaging can help you specify and source tamper-evident security bags for cash, evidence, healthcare, pharmaceutical, logistics and e-commerce applications, including plain stock and bespoke printed formats. Visit MSP Packaging to discuss your required size, material, closure, traceability features and supply volume.