Let’s be honest: you’ve probably been there. You’re loading a container, trying to fill the gaps between pallets, and you’re stuck between two types of dunnage bags—kraft paper composite ones and pure PP woven ones. You’ve heard one may be “more durable”, the other is “more cost-effective”, but no one gives you a clear answer on which one actually fits your shipment.
So let’s cut through the noise and break down exactly how to choose the right dunnage bag for your cargo.
First, know what you’re actually buying
Before we compare, let’s clarify the structure of each bag—this is where most people get confused.
Kraft paper dunnage bags have a 3-layer build: the outer layer is kraft paper, the middle layer is PP woven fabric, and the inner layer is a high-barrier PA air bladder.
PP woven dunnage bags have a 2-layer build: just the PP woven outer shell and the PA inner air bladder—no kraft paper layer.
That extra kraft paper layer isn’t just “extra material”—it changes how the bag performs in real-world shipping conditions.
What is your shipping environment?
This is the single most important question you should ask yourself.
If your cargo is going through ocean freight, especially across tropical or high-humidity routes, moisture is your enemy. Kraft paper, by nature, absorbs moisture. When it does, the outer layer softens, and the bag loses some of its structural integrity. PP woven dunnage bags, on the other hand, are inherently moisture-resistant — the woven polypropylene does not absorb water, so the bag performs consistently whether it is sitting in a dry warehouse or a humid container at sea.
That said, if you are running short-haul domestic trucking in a dry climate, or moving goods through a controlled warehouse environment, the moisture advantage of PP woven becomes less critical. Kraft paper bags perform perfectly well in these conditions, and their added rigidity can actually be a benefit during loading.
Ask yourself: Will this container face rain, high humidity, or extended transit times? If yes, lean toward PP woven. If the environment is dry and controlled, either type works.
What does your cargo look like?
Not all cargo is created equal, and the shape, weight, and surface of your goods should influence your choice.
Kraft paper dunnage bags are stiffer and have a higher surface friction coefficient thanks to the kraft paper exterior. This means they grip pallets and container walls more firmly, which helps prevent lateral sliding during transit. If you are shipping uniformly shaped, palletized goods with flat surfaces — like cartons, cases, or boxed products — kraft paper bags can provide excellent stability.
PP woven dunnage bags are more elastic and flexible. They conform more closely to irregular shapes and uneven surfaces, giving you greater contact area with the cargo. If you are shipping machinery, equipment with protruding parts, or loads with uneven surfaces, the flexibility of PP woven allows the bag to mold around those contours and distribute pressure more evenly.
For heavy loads, both types are available in heavy-duty ratings. However, PP woven bags generally offer higher puncture and tear resistance, which matters when your cargo has rough or abrasive surfaces.
Ask yourself: Is my cargo uniform and palletized, or irregular and heavy? The answer will point you in the right direction.
Environmental Compliance & Recycling Adaptability
With increasingly strict global packaging recycling regulations, material composition has become a key factor in cross-border shipping. The kraft paper + PP woven composite structure belongs to mixed materials, which cannot be directly recycled by conventional paper or plastic recycling systems, resulting in high disposal costs and even customs clearance obstacles in some regions.
The PP woven + PA inner film structure is a single plastic-based material, compatible with mainstream plastic recycling processes. It complies with EU PPWR and other international environmental standards, helping customers avoid environmental compliance risks in cross-border trade.
Have you measured your voids correctly?
This is not about material choice, but it is the most common mistake we see — and it does not matter which bag you pick if you get this wrong.
Before ordering anything, measure three things:
- The gap width between your cargo units (after the container is 90–95% loaded)
- The height of your cargo stack
- The depth of your pallets or packaging
Choose a dunnage bag whose inflated width matches your void and whose inflated height covers your cargo height. A bag that is too small will not fill the void properly. A bag that is too large will overinflate and risk bursting. PackBest provides a full regular size chart to help you match your measurements to the right specification — use it.
Do your pallets have sharp edges?
If your cargo is on wood pallets, in wood crates, or has any sharp corners, you need to protect the bag from puncture — regardless of which type you choose.
Place corrugated cardboard or honeycomb panels between the bag and any sharp edges. This is not optional. Both kraft paper and PP woven dunnage bags can be punctured by untreated wood edges, and a punctured bag is a useless bag.
Do not overlook the valve
The valve is the small part that makes or breaks the entire system. A poorly made valve will leak air, deflate during transit, and leave your cargo unprotected — no matter how strong the outer material is.
PackBest patented film valve unsure flexible inflating operation and longer air retention.We offer both standard valves and quick-inflate valves, as well — the quick valve can cut your inflation time significantly, which adds up when you are filling dozens of bags per container.
At PackBest, we manufacture both kraft paper dunnage bags and PP woven dunnage bags in all standard sizes — and we customize dimensions, valve types, and printing to fit your exact requirements. If you are still not sure which type fits your shipment, send us your cargo details, transit route, and pallet specs. We help you evaluate your cargo, route, and loading conditions so you can choose with confidence—whether that’s kraft, PP woven, or a mix of both.
