No products in the cart.


MIL-PRF 131 Packaging & Materials

MIL-PRF 131 is a military specification by the Department of Defense (DoD), which sets forth specific requirements for heat-sealable, greaseproof, flexible barrier materials with low water vapor transmission characters for use in military (MIL) packaging. MIL-PRF 131 sets the standard for the film and roll material, while MIL DTL 117 sets the standard for the pouch’s construction.
Military Packaging is an aluminium foil & PE construction with the addition of a high strength Valcross membrane layer

Currently, MIL-PRF 131 is broken out into three categories, or classes: 

  • MIL Class 1- Plastic backing (non-woven) 

  • MIL Class 2- Kraft  backing (limited use) 

  • MIL Class 3- Scrim backing (woven fabric) 

MIL Class 1 is by far the most widely used and popular class for MIL-PRF 131 packaging, but CarePac offers packaging that can comply with all three classes. It’s important to note that the roll material itself has to be made by a company that’s approved by the DoD, and only two companies have this approval: Berry Global and Cadillac Packaging. As such, pretty much all our bags are constructed using materials from Berry Global and Cadillac Packaging.

Benefits of MIL-PRF 131 Packaging

Mil-PRF-131 Class 1 material is a water-vapor-proof, foil laminate barrier material

Although there are different classes of MIL-PRF 131, all of these high-barrier MIL films have similar properties, particularly a low oxygen, water, and vapor transmission rate. The only material that can provide this level of protection is aluminum. As such, each of these bags will have an aluminum foil layer. 

To be approved for use by the DoD, the MIL packaging materials must pass rigorous testing of a set number of specific criteria. Some of those criteria are its breaking strength, proving it is puncture resistant, and corrosion protection. 

Additionally, the pouch must be heat-sealed to provide a strong, airtight seal. It sho9uld also be clearly marked with identifying information including the manufacturer's name, lot number, and a product ID number. 

Curious about the specific differences between MIL Class 1, Class 2, and Class 3 MIL-PRF 131 pouches? Read on to learn more about their benefits, including corrosion protection!

MIL-PRF 131 Packaging & Materials

MIL-PRF 131 Class 1 is a stretch film that’s used for packaging things that need protection from moisture and other environmental factors. Bags that are compliant with MIL-PRF 131 must adhere to certain strength and durability requirements. They must also resist exposure to chemicals and various other environmental hazards.  These MIL films are Grease proof, water vapor barrier, and heat-seable.

Due to these characteristics, MIL-PRF 131 pouches are typically used to package sensitive military equipment, like computerized devices and guns. These bags meet very strict standards, and the products they package are all but guaranteed to be protected in extremely challenging situations. 

Learn more about the different types of MIL-PRF 131 T1 C1 MIL-SPEC films:





Often used for vacuum crating.

90ga OPP/15# LDPE/30ga foil / 2.25 LDPE/LLDPE ~4.4 mil


Thinner variant of CadPak P.

90ga OPP/10# LDPE/30ga foil / 1.25 LDPE/LLDPE ~3.2 mil


Multi-use Flexible barrier film. 

60ga BON / 15# LDPE / 30ga Foil / 2.25mil LDPE/LLDPE ~4.2mil


Similar film parameters to Cad Pak N

.6mil BON / 1.4mi PE / .0003 Foil / 1.2 mil PE / 1.5mil LLDPE ~5.2 mil


Extreme strong tyvek film.  

Tyvek / .000285 Foil / LLDPE


Very high barrier film. 

60ga Bon / 14# LDPE / 30ga Foil / 6mil heavy-duty PE (green) ~7.9 mil

What is MIL-PRF 131 Class 2?

MIL-PRF-131 Type 1 Class 2 pouches are designed for barrier use in military applications, but have slightly different requirements they must meet when compared to Type 1 Class 1 pouches. Currently, CarePac offers one type of MIL-PRF 131 T1 C2 SPEC film: KF 1312. 

This film meets the criteria set forth by the Department of Defense. Pouches constructed from MIL-PRF 131 Class 2 films are guaranteed to meet the specifications required in regards to strength, durability, and resistance to environmental factors. It’s important to note that the requirements for Class 2 pouches are less strict than Class 1 pouches, so this type of packaging is used in less extreme conditions or for less critical applications. Regardless, they are crafted to the highest standards and will meet all necessary criteria.

Kraft Foil Material | MIL-PRF-131 | Protect KF

What is MIL-PRF 131 Class 3? 

What differentiates Class 3 films from Class 1 or Class 2 MIL-PRF 131 films? Well, Class 3 materials provide protection against electromagnetic interference (EMI) and radio frequency interference (RFI), while Class 1 and Class 2 films do not. This means that Class 3 pouches are designed to package electronic equipment, communication devices, and other items that are sensitive to this type of interference.

Class 3 materials are thicker and more rigid, and require special testing to ensure they provide protection against EMI and RFI. Learn more about our MIL-PRF 131 Class 3 materials below:




MS 1311

For extreme application. 15 mil. 

Scrim / .000285 Foil / LLDPE ~15 mil

Cad Pak S

MS 1311 competitor 

Poly Cotton Scrim / 30# LDPE/ 35ga Foil / 2.5 mil LDPE/LLDPE ~13 mil

CarePac: Your Partner in MIL-PRF 131 Packaging

Pouch bag Laminated OPP/PE/Foil/PE materials provide superior vapor and oxygen barrier properties

Whether you need barrier bags that adhere to MIL-PRF 131 Class 1, 2, or 3, or another type of military specific specification, we’re a partner you can count on. We’ve been manufacturing packaging for sensitive industries, including the military, for decades, and can help you craft packaging that complies with MIL-PRF 131. Have questions? Connect with us today to discuss your project. Ready to get started? We are, too! Get an Instant Quote! 

Overwhelmed with
all the options?


Welcome to Our New Site!

We hope you like the updated look and feel. Be sure to check out our new instant online calculator too