Security Bags

Security Bags — how to choose and use them without mistakes

Tamper-evident security bags protect sensitive contents and make any unauthorised opening immediately visible thanks to VOID closures, security seams and sequential numbering. This guide helps you select the right model and apply it correctly for logistics, cash handling, labs, retail, returns and DIY.

Quick selector by use case

• E-commerce & returns: VOID no-residue bag, write-on panel and external document pouch for labels/delivery note.
• Cash handling/valuables: bag with tear-off receipt, dual numbering + barcode/QR, anti-tamper security print.
• Forensic/lab: transparent evidence bag with fields for signature, date, contents and chain of custody.
• Pharmacy/clinical: opaque (privacy) bag with VOID closure; optional temperature/humidity indicator.
• Keys/documents in transit: reusable zip pouch + numbered seal (traceability without consuming a single-use bag for each pass).

Specifications that really matter

• Internal size (W × H × gusset): leave margin; avoid operating at full volume.
• Film thickness (μm): higher = better tear/puncture resistance; match to weight and sharp edges.
• Closure type: VOID hot-melt (instant evidence), heat-seal (high integrity), zip + seal (controlled reuse).
• Material: opaque coex for confidentiality, transparent for visual check; anti-tear/anti-puncture where needed.
• Traceability: sequential numbering, barcode/QR, tear-off receipt; customisation (logo/warnings/codes).
• Write-on panels: for from/to, contents, signature, date; simplify audits in regulated environments.

Application procedure (SOP)

1. Prepare the bag: check integrity, serial and the right format for the contents.
2. Filling: max ~80% volume; protect sharp edges (cardboard/padding) to avoid stressing seams.
3. Closure: remove liner, close from centre to sides applying even pressure along the security strip.
4. Set the proof: allow adhesive/closure to bond; check the VOID indicator window is continuous and intact.
5. Record: note serial (and barcode/QR) on the delivery note/system; optional photo of the applied seal.

Inbound checks

• Serial consistency: expected number = present number (on bag and receipt, if any).
• Closure integrity: no cuts/reopenings; VOID message absent (if intact) or clearly visible (if tampered).
• Seams: no pinholes or delamination; flaps fully bonded.
• Weight/volume: consistent with documents; if in doubt, follow escalation procedure.

Mistakes to avoid

• Overloading the bag: undermines closure and may open seams.
• Closing over dust/oil: always clean the adhesive area before sealing.
• Using standard mailers instead of tamper-evident bags when evidence of opening is required.
• Skipping serial logging: without records, the chain of custody is weak.
• Transparent when privacy is needed: choose opaque for documents/valuables.
• Cold environments without a low-temperature version: adhesive may stiffen and lose bond.

Quick FAQ

• Can they be reopened? Single-use bags cannot (tampering remains visible). For multiple passes, use zip pouch + numbered seal.
• Weather resistance? Yes, with film/adhesive rated for outdoor/low-temp; check the specified range.
• Customisation? Yes: logo, warning texts, colours, numbering and barcode/QR for traceability.
• Attach documents? Choose models with an external document pouch for labels and delivery notes.

Golden rule: select the bag by risk, privacy, traceability and environment, not just price. The wrong bag costs more than the contents it should protect.