Knowledge Centre, Materials & Specifications
Seams, Zips and Closures: Where Body Bags Really Leak
A body bag is only as good as its weakest join. In practice that is usually the seam or the zip.
Seam types
- Heat-sealed / welded seams: the film is fused to itself using heat or radio-frequency (RF) welding. A good weld is continuous and does not create needle holes. Preferred for fluid containment.
- Sewn seams: stitching makes needle holes. Sewn seams may be taped or sealed to improve resistance, but untreated sewn seams should not be considered leak-resistant.
- Folded or envelope bottoms: some bags use a fold rather than a seam at the base, removing one potential leak path.
Zip configurations
| Type | Description | Best for |
|---|---|---|
| Straight (central) | Runs down the middle of the top panel | Routine hospital use; low cost |
| C-shaped / J-shaped | Curves around the head end and down one side | Easier placement and viewing of the face |
| U-shaped | Runs around three sides, opening a large flap | Heavy, bariatric or difficult placements |
| Perimeter / D-shaped | Opens almost the entire top panel | Disaster recovery, partial remains, forensic examination |
Zip quality
Look for heavy-duty coil or moulded zips, a flap or storm cover over the zip to reduce seepage, and pulls large enough to use with gloves. Zip tape should be welded or securely bonded to the bag.
Securing the closure
- Lockable pulls that accept a cable tie.
- Numbered tamper-evident seals for forensic and chain-of-custody use.
- Adhesive or heat-sealed outer bags in high-barrier protocols.
Questions to ask
- How are the seams made – welded, RF-welded, sewn, taped?
- Is there a zip flap?
- Can the zip be locked or sealed?
- Has the complete bag (not just the film) been tested for leakage?
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Educational resource only. This article does not replace facility protocols, infection-prevention policies, official forensic procedures, manufacturer instructions or legal advice. Always verify product suitability against the applicable protocol and supplier test evidence. Last reviewed: October 2026.
