Product range
Tamper Evident Bag Tape Range
TamperTech’s tamper evident bag tape is the closure system used to manufacture security bags — cash and coin bags, evidence bags, duty-free bags and similar secure pouches.
It is supplied as the closure tape, not as a finished bag. The bag construction and the closure work together, so the correct tape level depends on the evidence and attack indicators the application requires. When the closure is interfered with it reveals a message or pattern on the bag surface — that is tamper evidence, and it supports loss prevention and chain of custody rather than preventing access.
Deciding order: what you are sealing → what evidence you need → what numbering or identification is required → which level fits → bespoke bag closure.
The range runs from Level 2 through to Level 6, each level adding a further security layer — void and void cold, thermochromic, security cuts, hidden UV print and water fugitive ink. Any bag tape in the range can be customised.
Choose the application
Where bag tape is used
Start from the bag and what it carries, then choose the security level the application justifies.
Coin security bags
45mm wide tape strong enough for heavy coin bags, showing clear visible signs of tampering if the bag is opened.
Typical use: Financial institutions, armoured car services, retail cash handling.
View coin security bags →
Evidence integrity bags
Void Cold and thermochromic layers keep the evidence message visible in cold storage and reveal heat attacks on the adhesive.
Typical use: Law enforcement chain of custody, forensic samples, seized items.
View evidence integrity bags →
Duty-free security bags
A clear VOID message, available in multiple languages, deters substitution and confirms integrity across borders.
Typical use: Duty-free retail, perfumes, alcohol, tobacco, high value travel retail.
View duty-free security bags →
Bag tape security levels
Level 2 to Level 6 constructions, each adding a further layer of tamper evidence to the one before.
Typical use: Choosing the right level for the bag, the industry and the application.
View bag tape security levels →Security levels
Tamper evident bag tape levels
Bag tape levels ensure you have the right security for each bag, industry and application. Each level builds on the one before it.
The foundation of security
Void and void cold
Upon removal the tape reveals a clear “VOID” message on the bag surface, leaving no doubt of tampering. Void cold ensures the message still appears at cold temperatures.
Introducing heat detection
Void, void cold & thermochromic
A thermochromic layer changes colour when exposed to heat, revealing a hidden message or pattern. This detects attempts to bypass the adhesive with heat, such as a hairdryer.
Physical tamper indicators
Void, void cold, thermochromic & security cuts
Pre-scored security cuts weaken the tape at specific points, so it tears irregularly if someone attempts to remove it without breaking the seal.
Covert protection
Void, void cold, thermochromic, security cuts & hidden UV print
A hidden UV print is invisible to the naked eye but visible under UV light, and can carry your logo, sequential numbers or other unique identifiers for covert authentication.
The most comprehensive construction
All Level 5 features plus water fugitive ink
A water-fugitive ink layer dissolves on contact with water, giving a clear indication of tampering attempts involving water or other liquids — valuable where moisture exposure is a concern.
Levels are cumulative, but a higher number is not automatically the better choice. The right level is the one carrying the evidence the application justifies — if you are not sure, we will advise.
How it works
What is tamper evident bag tape?
A specialised adhesive closure tape used to seal manufactured security bags, designed to show clear evidence if a sealed bag has been opened or interfered with. The adhesive leaves a visible message or pattern — most commonly “VOID” — on the bag surface when removed, which cannot easily be removed or replicated.
Void cold
Ensures the message appears even at low temperatures, offering wider protection.
Thermochromic
Reveals a hidden message or pattern when exposed to heat, deterring attempts to bypass the adhesive with tools such as hairdryers.
Security cuts
Pre-scored lines weaken the tape at specific points, causing it to tear irregularly if someone tries to remove it without breaking the seal.
Hidden UV print
Invisible to the naked eye but reveals a logo, number or other identifier under UV light, providing covert security and authentication.
Water fugitive ink
Dissolves on contact with water, showing tampering attempts that involve water or other liquids.
Customisation
Any bag tape in the range can be printed with your own void message, branding, sequential numbering or barcodes.
Start in the right place
Bag tape, box tape, or a numbered record?
Bag tape is a specific construction for sealing the mouth of a flexible bag. It is not the same product as tamper evident box or pallet tape, and the two are rarely interchangeable. Pick the route that matches the pack in front of you.
Sealing a bag
Bag tape is applied to the bag mouth or lip and has to seal a flexible, often filled bag.
Sealing a carton, pallet or box
If the pack is rigid, bag tape is the wrong construction. These are the box and pallet tapes.
Adding a number or a record
Most bag work is about reconciling a sealed bag against a log, not the seal alone.
If the bag, the contents or the temperature it travels at sits outside these routes, send us the bag and we will specify the level and format.
Questions
Tamper evident bag tape FAQs
Bag tape levels and the features that separate them.
What are the Tamper Evident Bag Tape Levels?
Tamper evident bag tape levels ensure that you have the right bag tape security for each security bag and its industry and application. Utilising a special adhesive that leaves a visible message or pattern upon removal, creating a clear indication of tampering. This gives a visible tamper alert: it reveals interference rather than preventing access. TamperTech offers a variety of levels, each building upon the previous one to deliver enhanced security features.
TamperTech’s security bag tapes give a consistent, visible indication if a sealed bag has been opened or interfered with. Levels 2 to 6 differ in which indicators they carry, so the right choice is the level that matches the evidence your application needs rather than the highest number available.
Note: This information provides a general overview of Tamper Technologies’ security bag tape offerings. It is recommended to contact TamperTech directly for the latest product information, customization options, and pricing details.
What is Level 2 Bag Tape?
Level 2: The Foundation of Security
- Void and Void Cold: This is the base level of security bag tape. Upon removal, the tape reveals a clear “VOID” message on the bag surface, leaving no doubt of tampering. Additionally, “Void Cold” functionality ensures the message appears even at cold temperatures, offering a wider range of protection.
What is Level 3 Bag Tape?
Level 3: Introducing Heat Detection
- Void, Void Cold & Thermochromic: Building on Level 2, this level incorporates a thermochromic layer. This layer changes color when exposed to heat, revealing a hidden message or pattern in addition to the standard “VOID” message. This provides an extra layer of security, as it can detect attempts to bypass the adhesive using heat, such as with a hairdryer.
What is Level 4 Bag Tape?
Level 4: Adding physical tamper indicators
- Void, Void Cold & Thermochromic & Security Cuts: This level elevates security further by integrating security cuts into the tape itself. These pre-scored lines weaken the tape at specific points, causing it to tear irregularly if someone attempts to remove it without breaking the seal. Combined with the thermochromic layer and the “VOID” message, this creates a clear, visible record of interference.
What is Level 5 Bag Tape?
Level 5: Adding Covert Protection
- Void, Void Cold & Thermochromic & Security Cuts & Hidden UV Print: This level incorporates a hidden UV print into the tape design. This print is invisible to the naked eye but becomes visible under a UV light. Businesses can customize the UV print with logos, sequential numbers, or other unique identifiers, adding an additional layer of covert security and authentication.
What is Level 6 Bag Tape?
Level 6: The most comprehensive construction
- Void, Void Cold & Thermochromic & Security Cuts & Hidden UV Print & Water Fugitive: This is the most comprehensive construction in the TamperTech bag tape range. It combines all the features of Level 5 with a water-fugitive ink layer. This ink layer dissolves upon contact with water, providing a clear indication of tampering attempts involving water or other liquids. This is particularly valuable for situations where moisture exposure might be a concern.
Samples & quotations
Request bag tape samples or a quotation
Tell us the bag, the contents, the temperature range and the volume and we will recommend a level, send samples, or quote. Use the form below and the technical team will respond.
Not sure which level or construction will work? Put it through the Security Lab — send us the pack and we will help specify it.
Contact Us
Get in touch today
Tamper Technologies Ltd,
The Oaks, Moor Farm Road West,
Airfield Industrial Estate,
Ashbourne, Derbyshire,
DE6 1HD, United Kingdom.
Phone: +44 (0) 1335 300335
WhatsApp: +44 (0) 7528 477703
Email: harriet@tampertech.net
Where to look next
Bag tape is the closure technology for security bags. If you are sealing cartons, cases or pallets instead, compare the tamper evident tape range. For bag and pack manufacture, see tamper evident packaging manufacture.