5 min read · · CleanCut team
Tyvek®, paper, or foil? Choosing a chevron pouch or header bag for your device
Chevron pouches and header bags do most of the work in flexible sterile packaging. The right one depends on your device, your sterilization method and how much barrier the product needs. Here is how Tyvek®, paper and foil pouches compare, and when a header bag makes more sense.
Not every device needs a rigid tray. Needles, syringes, catheters, small instruments and many kit components ship in flexible pouches. Bulky devices and kits often go in header bags. Both are simpler and lighter than a tray, and both can form a complete sterile barrier system when the materials suit the device and the sterilization method.
The choice usually comes down to four questions:
- How will the device be sterilized?
- How heavy or sharp is it?
- How sensitive is it to moisture, oxygen or light?
- How will it be opened and presented?
How a chevron pouch works
A chevron pouch has a V-shaped seal at the opening end. The user separates the two webs at the point of the V and peels them back. Starting a peel at a point takes less force than breaking a straight seal along its full width, so the opening is smooth and controlled. That allows a controlled peel and a clean presentation of the device into the sterile field.
Most chevron pouches pair a porous web with a clear film. The porous side lets sterilant in and out. The film side lets the user see the device. Foil is the exception, covered below.
Tyvek® chevron pouches
Tyvek® chevron pouches pair Tyvek® on one side with a clear film on the other. For sharp or pointed devices, ask us about a film with higher puncture resistance.
Tyvek® is strong and tear resistant, and it gives a clean, low-particulate peel. These pouches are compatible with EtO, gamma and e-beam. Typical applications include needles, syringes, catheters and small instruments.
Choose Tyvek® when the device has edges or points, when a clean peel matters, or when the package will see rough handling.
Paper chevron pouches
Paper pouches pair medical-grade paper with a clear film. They are economical, give a strong barrier, and print very well. They suit EtO, and gamma depending on the paper grade. If a device must be steam sterilized, ask us.
Paper is less tear and puncture resistant than Tyvek®. Uncoated paper can also lift fibers at the seal when the pouch is opened. Paper pouches are a good fit for procedure-kit components and general devices without sharp features.
Foil chevron pouches
Foil pouches use a foil laminate. The foil gives a near-total barrier to oxygen, moisture and light. That protects sensitive devices, diagnostics and reagents that need a long shelf life.
The same barrier means foil is not gas-permeable. EtO cannot pass through it, so foil pouches are typically radiation sterilized with gamma or e-beam.
Header bags
A header bag is a heavy-duty LDPE bag with a porous header strip across one end. The strip lets sterilant in and out, and the film body carries the load. Header bags suit bulky or heavy devices and kits that are too large or too heavy for a pouch. They are compatible with EtO through the header, and with gamma and e-beam.
Side-by-side comparison
| Property | Tyvek® chevron pouch | Paper chevron pouch | Foil chevron pouch | Header bag |
|---|---|---|---|---|
| Construction | Tyvek® with clear film | Medical paper with clear film | Foil laminate | LDPE bag, porous header |
| Gas-permeable | Yes | Yes | No | Through the header |
| EtO | Yes | Yes | Ask us | Yes, through the header |
| Gamma | Yes | Depends on paper grade | Yes | Yes |
| E-beam | Yes | Ask us | Yes | Yes |
| Steam | Ask us | Ask us | Ask us | Ask us |
| Main barrier | Microbial | Microbial | Oxygen, moisture, light and microbial | Microbial |
| Puncture resistance | High | Moderate | Good | Heavy-duty gauge |
| Relative cost | Moderate | Economical | Higher | Depends on size |
| Best for | Sharp or pointed devices, clean peel | Kit components, general devices | Moisture-, oxygen- or light-sensitive products | Bulky or heavy devices and kits |
Puncture ratings are relative, not test results. Compare slow-rate puncture data (ASTM F1306) from each material's data sheet for your device.
Compatibility depends on grade, coating and your process. Validate in your own sterilization cycle.
Protecting the pouch from the device
The device is often the biggest threat to its own package. Sharp tips, edges and heavy parts can wear or puncture a web during shipping.
An HDPE mounting card holds the device in place and keeps it off the pouch walls. We cut these in our ISO Class 8 cleanroom from 100% virgin HDPE, as pre-cut shapes or as rollstock on plastic cores. Slots, tabs and cutouts are cut to fit your device.
For thin, flexible layers such as liners and interleaves, we also cut HDPE/LDPE film components at 28–60 µm (≈1.1–2.4 mil). These are not a substitute for a rigid card. They separate and protect, but they do not hold a device in position.
Sizing and options
Custom sizes, printing and seal options are available for pouches and bags. Size the pouch so the device goes in without stressing the seals and clears the chevron when the pouch is peeled. A pouch that is too tight loads the seals. One that is too loose lets the device move and wear the webs.
All pouches and header bags are sourced from qualified manufacturers in North America and Europe. Manufacturer certificates are available on request. Each lot ships with our certificate of conformance, which records the manufacturer's lot number. Requirements for pouches are set out in EN 868-5, and for medical papers in EN 868-3, -6 and -7. The finished sterile barrier system is validated to ISO 11607-1 and -2 in the device maker's or contract manufacturer's own process. We do not claim compliance on your behalf.
Next steps
Narrow the options for your device with the material selector, or compare every format on the pouches and bags page. When you have a shortlist, request pouch samples or a quote.