Net Wrap vs. Sisal Twine: Calculating the Real ROI on Outdoor Storage Losses
Introduction: The Hidden Cost Nobody Talks About
Walk into most agricultural conversations about round baling costs and the discussion gravitates immediately to equipment, fuel, and labor. What rarely gets the attention it deserves is the cost that happens after the bale leaves the field — the slow, invisible drain of dry matter loss during outdoor storage.
For farms still using sisal twine to wrap round bales, this is the number that changes the entire economics of the conversation. Because while net wrap costs more per roll than sisal twine, the dry matter your twine-wrapped bales lose sitting in a field row is costing you money that never appears on an invoice — it just quietly disappears into the ground.
This article puts hard numbers on both sides of that equation. We calculate what outdoor storage losses actually cost per bale, per season, and per farm — and we show precisely when and how the switch from sisal twine to net wrap pays for itself.
The math, as it turns out, is not close.
Understanding Dry Matter Loss: What’s Actually Happening to Your Bales
Before the numbers, a quick explanation of the mechanism — because understanding why twine-wrapped bales lose more dry matter than net-wrapped bales explains why the loss figures are as large as they are.
The Bale Surface Problem
A round bale stored outdoors is essentially a cylinder sitting on the ground exposed to rain, sun, and temperature cycles. The outer layer of the bale — the “rind” — absorbs moisture from precipitation and dew, creating conditions for microbial activity, mold growth, and fermentation. This outer layer deteriorates into a weathered shell that insulates the core but is itself largely unfit for feeding.
The critical variable is how tightly and completely the bale surface is covered. A tighter, denser outer layer sheds water more effectively, limits air infiltration, and slows the progression of deterioration into the bale core.
Why Twine Loses More Than Net Wrap
Sisal twine wraps a bale in a series of parallel or spiral strands. Between those strands, the bale surface is open and exposed — to rainfall, air circulation, and UV degradation of the outer crop layer. The twine holds the bale shape, but it does not form a protective barrier across the bale surface.
Net wrap, by contrast, covers the entire curved surface of the bale in a continuous mesh. The net layer acts as a physical barrier that:
- Sheds rainfall rather than allowing it to penetrate
- Reduces air movement into the bale surface
- Maintains bale density and shape through the storage period
- Slows the progression of the weathered rind layer inward toward the feed-quality core
The result, consistently documented across North American agricultural extension research, is that net-wrapped bales stored outdoors lose significantly less dry matter than twine-wrapped bales over equivalent storage periods. The dry matter loss reduction from switching to net wrap is widely reported to be in the range of 10–15 percentage points under comparable outdoor storage conditions — though actual results vary by climate, precipitation, crop type, and storage surface.
The Research Consensus: What We Know
North American agricultural extension services have studied outdoor round bale storage losses extensively. While specific figures vary by region and study conditions, the directional findings are consistent across the research literature:
| Storage Method | Storage Surface | Indicative DM Loss Range — 6 Months |
|---|---|---|
| Sisal twine — outdoor, ground contact | Bare soil | Higher end of loss range |
| Sisal twine — outdoor, elevated (pallets/gravel) | Elevated | Moderate-high loss range |
| Net wrap — outdoor, ground contact | Bare soil | Moderate loss range |
| Net wrap — outdoor, elevated | Elevated | Lower loss range |
| Net wrap — covered storage (barn/shed) | Indoor | Minimal loss |
The consistent finding across research: net-wrapped bales stored outdoors lose meaningfully less dry matter than twine-wrapped bales under the same conditions — with the gap typically ranging from 10 to 15 percentage points of total dry matter. The exact figures for your operation will depend on your local climate, precipitation patterns, crop type, and how long bales sit before feeding.
For the ROI calculation below, we use conservative illustrative figures — 25% DM loss for twine-wrapped outdoor storage and 14% for net-wrapped outdoor storage — as a working model. We encourage you to adjust these inputs based on your own observed losses or local extension data.
The ROI Calculation: What Dry Matter Loss Actually Costs You
Setting Up the Model
We’ll build a concrete farm model to make this real. We use a mid-size hay operation as our baseline:
Farm Profile:
- Hay type: Mixed grass / alfalfa
- Annual bale production: 500 round bales
- Average bale weight (as baled): 1,200 lbs (545 kg)
- Storage method: Outdoor, ground contact
- Storage duration: Average 5–6 months
- Hay value: Variable by region and market — we use $150/ton as a working figure for this model. Adjust to your local market price.
- Current wrapping method: Sisal twine
Step 1: Calculate the Dry Matter in Your Bales
Starting point: 500 bales × 1,200 lbs = 600,000 lbs total forage as baled
At typical harvest moisture for dry hay, dry matter content is approximately 82% of as-baled weight.
Dry matter in 500 bales: 600,000 lbs × 82% = 492,000 lbs DM
Step 2: Calculate Dry Matter Loss Under Twine
Using our illustrative figure of 25% DM loss for outdoor twine-wrapped storage:
DM lost with twine: 492,000 lbs × 25% = 123,000 lbs DM lost
Converting to tons: 123,000 ÷ 2,000 = 61.5 tons of dry matter lost
At $150/ton hay value:
Dollar value of DM lost with twine: 61.5 × $150 = $9,225
Step 3: Calculate Dry Matter Loss Under Net Wrap
Using our illustrative figure of 14% DM loss for outdoor net-wrapped storage:
DM lost with net wrap: 492,000 lbs × 14% = 68,880 lbs DM lost
Converting to tons: 68,880 ÷ 2,000 = 34.4 tons of dry matter lost
At $150/ton hay value:
Dollar value of DM lost with net wrap: 34.4 × $150 = $5,160
Step 4: Calculate the Dry Matter Loss Difference
DM loss saving by switching to net wrap: $9,225 (twine losses) − $5,160 (net wrap losses) = $4,065 saved per season
This is the value of dry matter that remains in your bales at feeding time because you used net wrap instead of twine. It never appears on a feed bill. It never shows up as a line item on your income statement. But it is real forage — material that would have rotted into the ground that instead goes into your livestock.
Step 5: Calculate the True Cost of Each Wrapping Method
Net wrap cost for 500 bales:
A standard 48″ × 3,000 m net wrap roll wraps 200–300 round bales at typical settings of 2.5–3.5 wraps per bale. Using 250 bales per roll as our working figure:
- Rolls required for 500 bales: 500 ÷ 250 = 2 rolls
At a representative factory-direct price from Changzhou Xinhui Netting Co., Ltd.: approximately $65–85 per roll depending on weight and destination.
Using $80 per roll as our model price:
Net wrap cost for 500 bales: 2 rolls × $80 = $160
Sisal twine cost for 500 bales:
Twine consumption varies by baler and settings — a typical estimate is approximately 400–500 feet of twine per bale. At a common retail price of $35–45 per 9,000 ft ball:
- Twine required: 500 bales × 450 ft = 225,000 ft ÷ 9,000 ft per ball = 25 balls
- At $40 per ball: 25 × $40 = $1,000
Step 6: Calculate the Net ROI
| Sisal Twine | Net Wrap | |
|---|---|---|
| Wrapping material cost (500 bales) | $1,000 | $160 |
| Dry matter loss value | $9,225 | $5,160 |
| Total real cost | $10,225 | $5,320 |
| Difference | $4,905 less with net wrap |
Net wrap saves this 500-bale operation approximately $4,900 per season — after accounting for both the material cost difference AND the reduced dry matter losses.
Stated another way: net wrap costs $840 less to purchase than twine for 500 bales, and retains an additional $4,065 worth of dry matter. The combined benefit exceeds $4,900 per season for a single mid-size operation.
Sensitivity Analysis: How Does the ROI Scale?
The 500-bale model is one data point. Here is the same calculation across a range of farm sizes, using the same assumptions throughout.
Assumptions held constant:
- Bale weight: 1,200 lbs, 82% DM
- Hay value: $150/ton
- DM loss: 25% twine vs. 14% net wrap (illustrative figures — adjust to your conditions)
- Net wrap: $80/roll, 250 bales/roll (2.5–3.5 wraps per bale, 3,000 m roll)
- Twine: $40/ball, 9,000 ft/ball, 450 ft/bale
| Annual Bales | Twine DM Loss $ | Net Wrap DM Loss $ | DM Saving | Twine Cost | Net Wrap Cost | Net Annual Saving |
|---|---|---|---|---|---|---|
| 200 bales | $3,690 | $2,064 | $1,626 | $400 | $64 | $1,962 |
| 500 bales | $9,225 | $5,160 | $4,065 | $1,000 | $160 | $4,905 |
| 1,000 bales | $18,450 | $10,320 | $8,130 | $2,000 | $320 | $9,810 |
| 2,000 bales | $36,900 | $20,640 | $16,260 | $4,000 | $640 | $19,620 |
| 5,000 bales | $92,250 | $51,600 | $40,650 | $10,000 | $1,600 | $49,050 |
Note: These figures are illustrative models based on the assumptions stated above. Your actual results will depend on your local hay prices, climate, storage conditions, and observed loss rates. The directional conclusion — that net wrap significantly outperforms sisal twine on total cost when storage losses are included — holds consistently across all farm sizes and a wide range of input assumptions.
The Variables That Can Make Net Wrap’s ROI Even Stronger
Our model used conservative assumptions throughout. Several real-world variables push the advantage of net wrap further:
Higher Hay Values
Hay prices vary significantly by region, crop type, and season. Premium alfalfa in drought years or high-demand markets can trade at $200–$300/ton or higher. Every dollar increase in hay value per ton increases the dollar value of retained dry matter proportionally — strengthening the case for net wrap.
Longer Storage Periods
Our model used 5–6 months. Operations storing hay for 8–12 months — whether by choice or necessity — see total losses accumulate over a longer window. The gap between twine and net wrap losses tends to widen with extended storage duration.
Wetter Climates
Rainfall and humidity are the primary drivers of outdoor bale deterioration. Operations in the Pacific Northwest, upper Midwest, eastern Canada, or other high-precipitation regions experience greater absolute losses than our model captures — and the relative advantage of net wrap is correspondingly larger.
Heavier Bales
Large-format balers producing 1,500–1,800 lb bales increase the dry matter value at risk in every bale. The same percentage loss on a heavier bale means more tons — and more dollars — lost per bale stored.
Feed Quality, Not Just Weight
Our model values all hay at a flat price per ton. In practice, the outer layers of a deteriorating twine-wrapped bale lose not just weight but nutritional quality — protein, digestibility, and energy density all decline in weathered material. The feed-quality core of a net-wrapped bale that has maintained its surface integrity is nutritionally superior to an equivalent weight from a heavily weathered twine bale. For operations selling hay on quality or buying replacement feed, this nutritional premium has additional dollar value beyond the weight calculation.
Beyond the Numbers: Other Reasons to Make the Switch
The ROI calculation makes the financial case. But there are operational reasons to switch that the numbers don’t fully capture:
Faster Feeding Net-wrapped bales unroll more cleanly when fed with a bale processor or unroller. The intact bale surface means less deteriorated rind material to deal with before the livestock reach the feed-quality core.
Better Bale Shape Through Storage Net wrap maintains bale density and shape more effectively than twine through the storage period — improving stacking stability, maximizing bales per storage area, and reducing losses from bales shifting or settling.
Less Labor at Feeding Heavily deteriorated twine-wrapped bales require more handling at feeding time — removing degraded outer material and managing loose bale structure. Net-wrapped bales that have maintained their integrity take less time to feed out.
Faster Wrapping Cycle Modern round balers with net wrap systems wrap more quickly per bale than twine systems, reducing time at the baler during the critical harvest weather window.
The Remaining Objection: “Net Wrap Is Too Expensive”
This is the most common reason operations that would benefit from net wrap haven’t made the switch. Let’s address it directly with the numbers from this article.
The objection: “A roll of net wrap costs more than a ball of twine. I can’t afford it.”
The reality from our model:
For 500 bales, net wrap costs $160 versus twine at $1,000 — net wrap is already cheaper to purchase per bale than twine. Before a single storage loss figure enters the calculation, net wrap wins on material cost alone.
Add the dry matter savings and the total advantage exceeds $4,900 per season.
The “too expensive” objection has the economics exactly backward. The farms that cannot afford net wrap are paying significantly more — in lost forage — to use twine. The cost is real; it just doesn’t arrive as an invoice.
Making the Switch: What You Need
1. A net wrap-capable baler Most modern round balers support net wrap either as standard or as a retrofit. Check your operator’s manual or dealer if you currently run a twine-only machine — many older models can be retrofitted.
2. The correct net wrap width Net wrap must match your baler’s required width — 48″, 51″, 64″, or 67″ for North American equipment. Confirm the specification in your operator’s manual.
3. Understanding your wraps-per-bale setting A 3,000 m net wrap roll wraps 200–300 bales depending on your baler’s wraps-per-bale setting (typically 2.5–3.5 wraps). Higher wrap counts improve bale surface coverage and dry matter retention but reduce bales per roll. Most operators find 2.5–3 wraps a practical balance between surface protection and roll economy.
4. A reliable supply source at the right price Establishing a direct manufacturer relationship gives you consistent availability and the lowest possible per-roll cost — maximizing the ROI from the switch.
Changzhou Xinhui Netting Co., Ltd. — Factory-Direct Net Wrap
Changzhou Xinhui Netting Co., Ltd. is a professional net wrap manufacturer based in China, supplying farms and distributors across North America, Europe, Japan, and worldwide at factory-direct pricing.
Our net wrap is manufactured from 100% new (virgin) HDPE with integrated UV stabilizers — producing the consistent surface coverage and material integrity that deliver real dry matter retention in outdoor storage. Manufacturing quality matters here: inconsistently wound or dimensionally variable net wrap underperforms on surface coverage, which directly reduces the storage loss benefit the switch is supposed to deliver.
Why Farms Making the Switch Choose Xinhui Netting
100% New HDPE + UV Stabilized — Consistent full-surface bale coverage for maximum dry matter retention during outdoor storage
Consistent roll winding — Uniform winding tension throughout every 3,000 m roll for reliable feeding and consistent wraps-per-bale performance
All standard North American widths — 48″, 51″, 64″, and 67″ all available as permanent production lines
Multiple weight options — 7, 8, 9, 10, and 12 g/m² to match your crop type and baling conditions
Factory-direct pricing — The lowest cost per roll available for equivalent specification, maximizing your ROI from the switch
Private label available — For distributors supplying operations making the transition from twine to net wrap
Product Specifications
| Width | Length | Bales Per Roll* | Net Weight Options |
|---|---|---|---|
| 48″ (122 cm) | 3,000 m (9,840 ft) | 200–300 bales | 7 / 8 / 9 / 10 / 12 g/m² |
| 51″ (130 cm) | 3,000 m (9,840 ft) | 200–300 bales | 7 / 8 / 9 / 10 / 12 g/m² |
| 64″ (163 cm) | 2,134 m (7,000 ft) | 150–220 bales | 7 / 8 / 9 / 10 / 12 g/m² |
| 67″ (170 cm) | 2,134 m (7,000 ft) | 150–220 bales | 7 / 8 / 9 / 10 / 12 g/m² |
*Bales per roll based on 2.5–3.5 wraps per bale. Actual count depends on bale diameter and baler settings.
European sizes: 1.23 m, 1.25 m, 1.30 m in 2,000–3,600 m rolls Custom specifications: Width, length, weight, and color available on request
Frequently Asked Questions
Q: How much dry matter do twine-wrapped bales lose in outdoor storage?
A: North American agricultural extension research consistently documents meaningful dry matter losses in outdoor-stored round bales. Twine-wrapped bales stored outdoors on bare soil typically lose a substantially higher proportion of their dry matter than net-wrapped bales over a 5–6 month period. The precise figures vary by climate, precipitation, crop type, and storage surface — contact your local agricultural extension service for regionally specific data.
Q: How much less do net-wrapped bales lose compared to twine?
A: The difference in dry matter loss between twine and net wrap is consistently reported in extension research as approximately 10–15 percentage points under comparable outdoor storage conditions. Net wrap roughly halves the storage loss rate of twine-wrapped bales in most studied environments.
Q: Is net wrap actually cheaper than sisal twine?
A: On a per-bale basis, yes — net wrap typically costs less per bale than sisal twine even before storage losses are considered. A 3,000 m net wrap roll wraps 200–300 bales at standard settings, while the equivalent twine consumption for the same number of bales typically costs more in total material. When outdoor dry matter losses are included in the total cost calculation, net wrap’s advantage is substantial.
Q: How many bales does one roll of net wrap cover?
A: A standard 3,000 m net wrap roll wraps approximately 200–300 bales depending on bale diameter and your baler’s wraps-per-bale setting (typically 2.5–3.5 wraps per bale). Larger bale diameters and higher wrap counts reduce bales per roll; smaller bales and lower wrap counts increase it.
Q: What wrap count should I use for outdoor storage?
A: For bales destined for outdoor storage, 3 wraps per bale is a commonly used setting that balances good surface coverage with roll economy. Some operators in wetter climates or with longer storage durations use 3.5 wraps for additional surface protection. Fewer than 2.5 wraps may compromise surface coverage and reduce the dry matter retention benefit.
Q: Does net wrap work with my existing baler?
A: Most modern round balers support net wrap either as standard or as a retrofit option. Check your baler’s operator manual or consult your dealer. Many older twine-only balers can be fitted with net wrap retrofit kits.
Q: What net wrap weight should I use for outdoor hay storage?
A: For standard hay baling intended for outdoor storage, 8 g/m² is the most widely used specification. For dense crops like alfalfa, or in wetter climates where extended outdoor storage integrity is critical, 9 g/m² provides stronger surface coverage and better bale shape retention through the storage period.
Q: What is the minimum order from Changzhou Xinhui Netting?
A: Minimum order quantities depend on specification and destination. Contact us directly for a quote suited to your operation’s volume and requirements.
Conclusion: The Numbers Don’t Lie
The case for switching from sisal twine to net wrap is not a marketing argument — it is an arithmetic one. Every farm storing round bales outdoors is losing dry matter. The question is how much, and what it costs.
For twine-wrapped bales, the honest answer is: significantly more than the cost of net wrap — by a wide margin, at every farm scale, under every reasonable set of input assumptions.
The switch from sisal twine to net wrap is one of the few input decisions in agriculture where the ROI is not marginal but overwhelming — paying for itself immediately, returning multiples of its cost in retained forage value, and doing so more reliably as farm scale, hay value, and storage duration increase.
Changzhou Xinhui Netting Co., Ltd. manufactures the net wrap that makes these numbers real — 100% new HDPE, UV stabilized, consistently wound to deliver 200–300 reliable bales per 3,000 m roll, at factory-direct pricing. If your operation is still using sisal twine for outdoor round bale storage, contact us today for a quote. The season your numbers change is the season you make the switch.
Contact Changzhou Xinhui Netting Co., Ltd.
Changzhou Xinhui Netting Co., Ltd. Professional Net Wrap Manufacturer | OEM & Private Label | Factory Direct Pricing
📧 : sale1@xinhuibalenetwrap.com
🌐 : https://xinhuibalenetwrap.com
Request a Free Quote Today →
Supplying farms, co-operatives, and distributors across North America, Europe, Japan, Australia, and worldwide.
