Quick answer: Film binding (also called film-on-film or bale-in-film) wraps the barrel of a round bale in stretch film inside the baler instead of open net wrap mesh. It shines for silage and baleage — denser bales, less trapped air, and one plastic to recycle. But it costs more per bale, needs a film-capable baler or baler-wrapper combi, and it is a poor fit for dry hay, where the sealed film traps moisture and grows surface mold. For most North American operations baling dry grass and alfalfa, net wrap remains the faster, cheaper, all-crop choice; film binding earns its keep on high-moisture silage.
Ask a room full of balers whether they'd swap net wrap for film and you'll get very different answers depending on what they cut. In wetter dairy country, film binding is spreading fast because it makes better silage. In dry-hay operations, most producers who have tried film in a standard baler came away frustrated. This guide breaks down net wrap vs. film binding honestly — what each does, where each wins, the real costs, and the machine question — using university research and the hard-won experience of farmers on HayTalk, AgTalk, and TheFarmingForum.
What is film binding (film-on-film)?
Film binding replaces the net in the bale chamber with a wide roll of stretch film — the same kind of plastic used to wrap silage bales. Instead of holding the bale with open mesh, the baler applies several layers of film around the barrel. For baleage, the bale then moves to a wrapper that adds the final airtight layers over that film, so the whole bale is bound and sealed in one material: plastic. That is why the technique is often called film-on-film or bale-in-film.
The idea came out of the silage world in Europe, where the goal is an airtight, well-fermented bale. Binding the barrel in film — rather than net — squeezes out more air, lets the outer wrap seal against a clean plastic surface, and produces a single-plastic bale that is easier to separate for recycling. It is now a factory option on many baler-wrapper combinations.
What is net wrap?
Net wrap is open-weave polyethylene mesh that wraps the barrel of a round bale in two to three turns as it leaves the chamber. It holds the bale's shape, sheds surface rain, and — critically — breathes. It is the default binding on the vast majority of round balers sold in North America because it is fast, inexpensive, and works across every crop from dry grass to cornstalks. If you want the fundamentals, see our guide to net wrap vs. twine and how many wraps per bale. Net wrap is not an airtight seal — and that difference is the whole story below.
Net wrap vs. film binding: side by side
| Factor | Net wrap | Film binding (film-on-film) |
|---|---|---|
| Best for | Dry hay, cornstalks, all crops | Silage & baleage (high moisture) |
| Breathability | Open mesh — lets dry hay breathe | Sealed — airtight when over-wrapped |
| Bale density & air | Good | Higher density, less trapped air |
| Cost per bale | Lower | Higher (more plastic used) |
| Recycling | Mesh + film are separate materials | Single plastic — easier to recycle |
| Machine | Standard on nearly every baler | Needs film-capable baler / combi |
| Speed | Fast wrap cycle | Slower; more layers to apply |
Where film binding wins
For silage and baleage, film binding brings real, measurable advantages:
- Better fermentation. Binding the barrel in film instead of mesh removes more air from the bale surface, and the final wrap seals film-to-film. Less oxygen means a cleaner anaerobic fermentation and, in trials, reduced surface spoilage on the finished bale.
- Denser, tighter bales. Film pulls the barrel in tighter than net, so you fit more forage in the same package — useful when you're hauling and stacking wrapped silage.
- One plastic to recycle. A net-and-film bale forces you to peel and separate two different plastics at feed-out. A film-on-film bale is a single material, which simplifies collection and recycling programs.
- Cleaner feed-out. Some producers find film binding peels away in one piece with less of the shredded-mesh mess that net can leave behind.
This is why film binding took hold first in wet dairy regions. As one producer weighing a Kuhn film-on-film baler against a net-only McHale on TheFarmingForum put it, the decision was "more about making quality than the colour of the machine." (TheFarmingForum, "Chop length or film on film bales")
One important caveat from that same thread: film binding is not a shortcut around good wrapping. "I've bought bales that are film on film and wasn't impressed, as the contractor cut back the outer wrap layers and there was patches of mold," one grower warned. "I still think you need to give a minimum of 4 layers." Total wrap layers and clean stacking still decide silage quality — the binding method alone won't save a thin wrap job.
Where net wrap wins
For everything that isn't sealed silage, net wrap keeps the advantages that made it standard:
- Cost. Net wrap uses far less plastic per bale than film and costs less to run. If you bale volume, the per-bale gap adds up fast — see our net wrap cost breakdown.
- Speed. Two to three turns of mesh wrap in seconds. Film binding lays down more material and runs a longer cycle, which slows you down in a big hay window.
- It breathes. Open mesh lets a dry bale continue to lose the last of its moisture and shed surface rain without sealing water inside — exactly what you want for dry hay in the barn or the field.
- Every crop, every baler. Grass, alfalfa, straw, cornstalks — net wrap handles them all, and it's already fitted to almost every round baler on the market with no special option to buy.
- Weather-shedding shape. A tightly net-wrapped bale holds a rounded, water-shedding surface through months of outdoor storage. See storing round-bale hay.
The dry-hay trap
Here is the mistake that shows up again and again on the forums: running plastic film in place of net on dry hay, hoping for a tighter, better-protected bale. It backfires, because film seals in the very moisture that dry hay needs to release.
It started to condensate by the next day under the plastic and molded the outside layer of the bale… But for me it didn't work.
Another grower in the same thread noted that "water would pool in the bottom of the bale trapped by the plastic when they were stored outside." And on the alfalfa board, a producer who wrapped dry hay in film found the same thing: "I wrapped dry hay in white film and it did have white surface mold… if you want to wrap dry round bales, you need to let them sweat inside for 2–3 weeks then wrap to lessen mold… Of course, if you had that much inside storage, you wouldn't need to wrap dry hay!" (HayTalk, "White film round bale wrap vs black")
The lesson: sealing plastic belongs on high-moisture forage you intend to ferment, not on dry hay. Dry hay wants to breathe. If you're baling dry, net wrap is the right tool; if you're chasing baleage, that's a different process entirely, and film has a place. For the wet-crop details, see wrapping wet hay and baleage vs. haylage vs. silage.
Can your baler even run film?
This is where a lot of the film-binding conversation ends before it starts. You generally cannot just drop a roll of silage film into a net-wrap baler and expect proper film-on-film bales. As one experienced HayTalk member replied to a grower asking exactly that:
Not happening unless you buy a baler/wrapper combo unit… There are no short cuts for proper baleage.
True film binding is a factory feature. Several manufacturers — including Kuhn, McHale (Fusion combi), Krone (Comprima), Vermeer, and John Deere — offer film-on-film as a baler or baler-wrapper option, with the film-in-chamber system engineered to feed, stretch, and cut the wide film reliably. Retrofitting a net-only baler to run film is not practical.
Note one common point of confusion: John Deere's B-Wrap is a different product — a breathable film-plus-net system aimed at protecting dry hay in outdoor storage — not a silage film-on-film binding. Don't conflate the two when you're spec'ing a machine. If you already run a wrapper, our bale wrapper buying guide covers the combi options.
Which should you choose?
Match the binding to the crop and the operation:
- Choose net wrap if you bale mostly dry hay, straw, or cornstalks; you value speed and low cost per bale; you want one binding that works on every crop; or your baler isn't a film-capable combi. This describes the majority of North American hay producers.
- Choose film binding if you make a lot of baleage or silage, you already run (or are buying) a film-capable baler-wrapper, and you want the densest bales, best fermentation, and single-plastic recycling — and you can absorb the higher per-bale cost.
- Run both if your operation splits between dry hay and silage — net for the dry crop, film for the wet. Many combi owners do exactly this.
Whatever binding you run for silage, if you're making dry hay you still want quality mesh that holds a tight, weather-shedding bale. Explore XES® Extreme bale net wrap, or compare specs in our best bale net wrap guide.
Frequently asked questions
What is the difference between net wrap and film binding?
Net wrap holds a round bale with open polyethylene mesh that breathes and sheds rain, ideal for dry hay. Film binding (film-on-film) wraps the barrel in solid stretch film instead, producing a denser, sealable bale that's built for silage and baleage. Net is cheaper and faster; film makes better fermented forage but costs more and needs a film-capable baler.
Can I use plastic film instead of net wrap in my regular baler?
Generally no. Proper film-on-film binding requires a baler or baler-wrapper combi engineered for film. Producers who improvise silage film in a net-wrap baler on dry hay typically report the film flapping loose, wrapping the roller, and — worst of all — trapping moisture that molds the outer layer. For dry hay, stick with net wrap.
Is film binding better for silage?
For silage and baleage, yes — film binding removes more air, seals film-to-film for a cleaner anaerobic fermentation, and yields denser bales with a single plastic to recycle. It is not a fit for dry hay, where the sealed film traps moisture and causes surface mold.
Does film binding cost more than net wrap?
Yes. Film binding uses considerably more plastic per bale than net wrap's two to three turns of mesh, so the material cost per bale is higher, and the wrap cycle is slower. For dry-hay operations baling volume, net wrap is far more economical.
Which brands offer film-on-film balers?
Film-on-film is offered as a factory option by manufacturers including Kuhn, McHale (Fusion), Krone (Comprima), Vermeer, and John Deere. John Deere's B-Wrap is a separate breathable dry-hay product, not a silage film-binding system. Retrofitting a net-only baler for film is not practical.
The bottom line
Film binding is a genuine step forward — for silage. If you make baleage and run a film-capable combi, film-on-film gives you denser bales, better fermentation, and a single plastic to recycle. But it's the wrong tool for dry hay, where sealed film traps moisture and grows mold, and it always costs more and runs slower than mesh. For the dry grass and alfalfa that fill most barns across North America, net wrap is still the faster, cheaper, breathe-easy binding — and it fits the baler you already own.
Baling dry hay this season? Start with mesh that holds a tight, rain-shedding bale through months of storage — explore XES® Extreme bale net wrap.
Sources: Producer experience from HayTalk.com threads "Plastic Film Instead of Net Wrap" (#26920), "Flim wrap vs net wrap" (#101819), and "White film round bale wrap vs black" (#102791); and TheFarmingForum.co.uk thread "Chop length or film on film bales" (#419964), all accessed July 27, 2026. Film-on-film availability reflects published manufacturer product information from Kuhn, McHale, Krone, Vermeer, and John Deere (accessed July 27, 2026). Silage fermentation principles reflect standard forage-conservation guidance from university extension. Match binding method to crop moisture and confirm machine compatibility with your dealer.
Featured photo: Hay bales wrapped in plastic by Nigel Williams, licensed under CC BY-SA 2.0, via Wikimedia Commons.
