By Biolastic Team · 23/10/2026
Compare compostable garbage bag sizes, bin-fit calculations, bags per kilogram, cost per usable liner and industrial compostability checks for global B2B buyers.
A waste bin can be labelled “20 litres” and still reject a perfectly good liner. The bag catches on the rim, slips down when the first food scraps go in, or tears when housekeeping lifts it out. The problem often begins with a purchasing decision made from bin capacity alone.
For hotels, restaurants, offices, apartment facilities and cleaning-product distributors, choosing a garbage bag is about matching the liner to the bin, the waste and the collection routine.
This guide compares three sizes listed in Biolastic's compostable garbage bag catalogue—17 × 19, 19 × 21 and 24 × 32 inches—and explains bin fit, bags per kilogram, cost per usable liner, sample testing and compostability documentation. The same approach is useful for buyers in Siliguri and North Bengal as well as procurement teams anywhere in the world.
| Listed size | Metric equivalent | Catalogue estimate, bags per kg | Approximate weight per bag |
|---|---|---:|---:|
| 17 × 19 inches | 43.18 × 48.26 cm | 55–60 | 16.7–18.2 g |
| 19 × 21 inches | 48.26 × 53.34 cm | 35–40 | 25.0–28.6 g |
| 24 × 32 inches | 60.96 × 81.28 cm | 20–25 | 40.0–50.0 g |
These are catalogue estimates, not independently measured results for the current production batch. They do not establish identical micron thickness, film construction or load capacity. Count and weight can change with colour, formulation, gauge and conversion tolerance.
Explore the individual listings: 17 × 19 inch bags, 19 × 21 inch bags and 24 × 32 inch bags.
Important: these dimensions are not universal bin-capacity ratings. Two bins holding the same number of litres can have completely different shapes.
A slim office bin and a broad kitchen bin may both hold 20 litres. The wider opening needs more bag width; the deeper bin needs more length. A thick rim changes the fit again.
Measure three things before ordering: the bin's opening, its usable depth and the amount of liner you want folded over the rim. If the bin tapers, use the widest opening. If the bag is tied before collection, allow extra length for closure.
For a simple flat tubular liner without side gussets, the first-pass geometry is:
Theoretical minimum lay-flat width ≈ π × bin-opening diameter ÷ 2
A flattened tube has two faces that together represent its circumference. This is only a starting check: a real bin has a rim, a bag has seams, and the film needs enough slack to fit without damage.
For a 30 cm diameter opening, the theoretical minimum is 47.1 cm. A 17-inch-wide bag is approximately 43.2 cm and would be too narrow by this check. A 19-inch bag is approximately 48.3 cm—barely above the theoretical minimum. A 24-inch bag is approximately 61.0 cm, providing more width but possibly unnecessary material.
Never approve a close match from mathematics alone. Pull a sample over the actual rim. Check whether staff can remove it without stretching or snagging.
For a rectangular opening, the first-pass flat-tube width is approximately opening length + opening width, because that equals half the rectangular perimeter.
A 30 × 20 cm opening therefore suggests a theoretical 50 cm lay-flat width before adding allowance. A 19-inch-wide bag is about 48.3 cm and may be too narrow. A 24-inch bag provides more width. Gussets and bag construction affect the result, so ask how the quoted dimensions are measured and test the corners.
Use this estimate:
Required bag length ≈ usable bin depth + bottom allowance + rim overhang
Suppose a bin is 45 cm deep, with 5 cm for the base and 10 cm folded over the rim. The initial length requirement is 60 cm. A 19-inch-long bag (48.3 cm) or 21-inch-long bag (53.3 cm) would be too short by this check. A 32-inch-long bag (81.3 cm) has sufficient nominal length but still needs a width and fit test.
If staff tie the top, leave room for the knot. Too much unused length also costs money, so choose the smallest size that passes the real test.
These are shortlisting ideas, not guarantees of fit, capacity or strength.
This size may be worth testing in desk-side, reception or lightly used washroom bins whose measured dimensions fit. Its catalogue estimate of 55–60 bags per kilogram may appeal to a facility that changes many small liners each day.
But a liner stretched tightly over the rim is not a saving. It can tear during installation or slip inside the bin after the first few items are added. Measure and test before assigning it to a housekeeping stock code.
The 19 × 21 inch format offers more width and length. It may suit selected office, pantry or hospitality bins if the opening, depth and waste type are compatible.
Biolastic lists approximately 35–40 bags per kilogram. That lower count does not mean inferior value. A correctly sized liner that survives collection can cost less to operate than a smaller one that fails.
For wet kitchen waste, run a leak test with representative contents. Film thickness, seal integrity and sharp waste matter more than the printed dimensions alone.
The 24 × 32 inch format has substantially more width and length. It is a possible sample choice for larger housekeeping, shared pantry, kitchen or facility collection points.
The catalogue estimates 20–25 bags per kilogram. The larger area generally means more material per bag, but large does not automatically mean heavy-duty. Test the intended filled weight, puncture behaviour, seal integrity and distance staff carry each liner.
Two bags can share the same dimensions but use different film thicknesses. The thinner one may cost less yet perform differently under puncture or wet waste. A thicker one may use more material without fixing a weak bottom seal.
Micron describes film thickness. It is not a guaranteed load rating.
Ask for the single-wall micron and tolerance, lay-flat width and overall length, gusset configuration, bottom-seal design, film composition, colour and packing unit. For heavy or sharp waste, agree on performance tests rather than relying on adjectives such as “premium” or “extra strong.”
Avoid universal claims such as “this bag carries 10 kg” unless the exact construction has been tested for the intended handling method.
Wholesale quotations are often by weight, while facilities count bags used per shift. The conversion is straightforward:
Average bag weight (grams) = 1,000 ÷ bags per kilogram
For 17 × 19 inches, the listed 55–60 bags/kg implies approximately 16.7–18.2 g per bag. For 19 × 21 inches, 35–40 bags/kg implies 25.0–28.6 g. For 24 × 32 inches, 20–25 bags/kg implies 40–50 g.
These are mathematical conversions of catalogue estimates, not weighed laboratory samples. Request a counted and weighed sample lot if your purchase order requires a precise count tolerance.
A change in micron, gusset, seal allowance, colour or conversion method can change mass. Do not calculate a final monthly count from net kilograms until the supplier confirms the exact specification.
A purchasing team may receive a price per kilogram while housekeeping records liners consumed. Convert quotations to the same unit:
Material cost per bag = quoted price per kg ÷ usable bags per kg
Here is an illustrative calculation at ₹180/kg. This is not Biolastic's confirmed selling price.
| Size | Approximate bags/kg | Illustrative material cost per bag |
|---|---:|---:|
| 17 × 19 inches | 55–60 | ₹3.00–₹3.27 |
| 19 × 21 inches | 35–40 | ₹4.50–₹5.14 |
| 24 × 32 inches | 20–25 | ₹7.20–₹9.00 |
Consider a property with 100 small bins. If each is changed twice daily for 30 days, the site uses 6,000 liners per month. At a hypothetical ₹3.20 each, film cost alone is ₹19,200, before freight, tax, labour and losses.
A small price difference matters when repeated thousands of times. But a lower price is useless if the bag fails and staff need a replacement.
Suppose a site buys 1,000 bags but 30 cannot be used because of damage or poor fit. The usable count is 970.
Cost per usable liner = relevant landed cost ÷ usable liners
Record failed seals, punctures, bags that slip into the bin and extra liners used for double-bagging. Include freight and other attributable costs. A cheaper per-kilogram quote can be more expensive per successful collection.
First, measure the bin. Fit the sample without forcing it over the rim. Fold it as the cleaning team normally would. Add a representative amount of real waste, not only clean paper. Check whether the liner stays in place, then remove it using the normal collection method.
Inspect the bottom seal and sidewalls. Repeat with several samples and a realistic heavy load.
For wet waste, check whether liquid migrates through the seal or puncture points. For sharp waste, inspect failures around corners and protrusions. If staff carry the bag over distance, include that movement in the trial.
A compostable claim should be backed by product-specific evidence. Industrial compostability and home compostability are not interchangeable, and a facility may refuse some certified materials depending on its process.
For India, buyers should review current requirements applicable to compostable plastic products and any necessary product or manufacturer approvals. International buyers should check destination-specific rules.
Do not assume that a generic “biodegradable” claim means the product can be placed in any composting stream. Likewise, do not mix compostable plastics into conventional plastic recycling unless the local system explicitly accepts them.
A useful quotation request includes the following:
| Requirement | What to provide or request |
|---|---|
| Application | Hotel, restaurant, office, residential or industrial |
| Bin measurements | Opening diameter or length × width; depth; rim |
| Bag geometry | Width, length, gusset and measurement convention |
| Film | Composition, single-wall micron and tolerance |
| Performance | Waste type, filled weight, seal and leak tests |
| Packing | Bags per roll, rolls per carton, net kg and count tolerance |
| Colour and printing | Waste-stream colour, artwork and approval |
| Compliance | Finished-product evidence and required labelling |
| Commercial | MOQ, samples, tax, freight, lead time and destination |
A quote for “100 kg of medium garbage bags” is not directly comparable to a quote with a defined size, gauge and count tolerance.
Imagine a site with 80 bins, changed an average of 1.5 times daily over 30 days:
80 × 1.5 × 30 = 3,600 liners per month.
An illustrative 10% planning reserve raises the requirement to 3,960 liners. If the approved sample averages 38 usable bags/kg, estimated product weight is 3,960 ÷ 38 ≈ 104.2 kg.
This is a planning example, not a recommended reserve or a confirmed packing configuration. Order in supplier packing increments and verify current count and lead time.
A restaurant in Siliguri may replace wet-waste liners several times a day. A hotel may use dozens of small room bins alongside a few larger housekeeping collection points. A warehouse or tea-estate office may mostly collect dry waste.
These are different requirements. One oversized bag for every bin is rarely the most efficient answer. Instead, standardise two or three approved sizes and assign each to specific locations.
Buyers in Darjeeling, Jalpaiguri, the Dooars, Cooch Behar and nearby markets should include delivery address, packing unit and replenishment lead time in quotations. Freight and repeat availability matter when a facility uses thousands of liners monthly.
Biolastic is based in Siliguri and lists compostable garbage bags with custom-size and custom-print enquiries subject to feasibility. Do not assume every custom specification is in stock.
Global buyers may need more than dimensions and a unit price. Compostability recognition, import rules, language and labelling requirements, collection systems and waste-contractor acceptance differ by country.
Before placing an international order, ask for the exact construction, relevant documentation, packing list, commercial terms and destination-specific evidence. An international enquiry is not an unconditional shipping promise. Export capability, freight, customs and landed cost require case-by-case confirmation.
We need compostable garbage bags for [hotel / restaurant / office / distributor] use. Our bins measure [opening width or diameter] × [depth] cm. Please quote samples for [17 × 19 / 19 × 21 / 24 × 32 inches] with lay-flat dimensions, gusset details, film composition, micron tolerance, seal construction, bags per kilogram, bags per roll, colour, monthly requirement [quantity] and delivery location [city/country]. Please include current finished-product compostability documents, applicable labelling, MOQ, lead time, freight terms and pricing with the count range stated.
A complete enquiry saves time for buyer and supplier, and makes samples easier to compare fairly.
Bin capacity alone cannot determine bag size. Measure the opening width or diameter and bin depth. Check lay-flat width, bottom allowance and rim overhang, then test an actual liner.
The figures describe nominal width and length, not guaranteed bin capacity or load rating. Biolastic lists indicative yields of 55–60, 35–40 and 20–25 bags per kilogram respectively.
Biolastic's catalogue indicates approximately 35–40 bags per kilogram for its 19×21 inch product. Actual count can vary with thickness, colour, construction and tolerance.
Divide the price per kilogram by usable bags per kilogram, then account for freight, applicable taxes and rejects. A hypothetical ₹180/kg at 40 bags/kg equals ₹4.50 per bag before other costs.
No. Compostable claims need product-specific evidence. A generic biodegradable claim does not establish industrial compostability, home compostability or local facility acceptance.
Not automatically. Ask the collector or composting facility whether it accepts the particular certified liners. Compostable plastics should not be mixed with conventional plastic recycling.
No. IS/ISO 17088 concerns industrial compostability, not home-composting performance. Check the finished-product evidence and intended disposal conditions.
International buyers can submit technical enquiries, but supply eligibility, documentation, certification recognition, minimum order, shipping and destination requirements must be confirmed.
A good liner does three unglamorous things reliably: it fits the bin, survives normal collection and arrives at a predictable cost. Compostability adds a fourth requirement: credible documentation and a disposal route that accepts the material.
Measure the bin first. Compare real samples of 17 × 19, 19 × 21 and 24 × 32 inch bags. Then calculate cost per usable liner rather than stopping at the price per kilogram.
Browse Biolastic's compostable garbage bag range or request a bulk quotation with measurements, monthly consumption and delivery destination.
Editorial note: Catalogue yields are indicative; worked prices and consumption examples are hypothetical, not quotations. Verify certification and waste-acceptance requirements for the finished product and destination.
Bin capacity alone cannot determine bag size. Measure the opening width or diameter and bin depth. Check lay-flat width, bottom allowance and rim overhang, then test an actual liner.
The figures describe nominal width and length, not guaranteed bin capacity or load rating. Biolastic lists indicative yields of 55–60, 35–40 and 20–25 bags per kilogram respectively.
Biolastic's catalogue indicates approximately 35–40 bags per kilogram for its 19×21 inch product. Actual count can vary with thickness, colour, construction and tolerance.
Divide the price per kilogram by usable bags per kilogram, then account for freight, applicable taxes and rejects. A hypothetical ₹180/kg at 40 bags/kg equals ₹4.50 per bag before other costs.
No. Compostable claims need product-specific evidence. A generic biodegradable claim does not establish industrial compostability, home compostability or local facility acceptance.
Not automatically. Ask the collector or composting facility whether it accepts the particular certified liners. Compostable plastics should not be mixed with conventional plastic recycling.
No. IS/ISO 17088 concerns industrial compostability, not home-composting performance. Check the finished-product evidence and intended disposal conditions.
International buyers can submit technical enquiries, but supply eligibility, documentation, certification recognition, minimum order, shipping and destination requirements must be confirmed.
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