Quick Answer
Compostable mailer bags are shipping envelopes made from plant-based and compostable resins that break down in industrial composting facilities. In India, buyers should look for CPCB certification, IS/ISO 17088 compliance, and a mandatory QR code on every bag. Wholesale rates are at around ₹120 to ₹350 per kg depending on blend, thickness, and print. UKHI manufactures its own EcoGran™ resin and converts it into finished mailer bags. Ask for free samples. We ship within 7 days.
What to Look for in a Compostable Mailer Bag Supplier in India
Before signing a purchase order, procurement teams need to check five things about any supplier of compostable mailer bags manufacturers in India.
CPCB Certification
Under India’s Plastic Waste Management Rules, no compostable mailer bags manufacturers in India can legally sell compostable products without a certificate from the Central Pollution Control Board. Every certified bag must also carry a QR code. When scanned, the code should show the manufacturer’s name, plant address, and CPCB certification number. If the QR code is missing or does not point to these details, the bag is not legally compliant.
Compliance with IS/ISO 17088
IS/ISO 17088 is the primary Indian standard for compostable plastics. For exports, the relevant standards are EN 13432 for Europe and ASTM D6400 for the United States. Ask the supplier for the actual test reports.
Resin Manufacturing Capability
Check whether the compostable mailer bags manufacturer makes the resin themselves or buys it from someone else and only converts the film into bags. A supplier who controls the resin can adjust the material blend for the specific bag being ordered. A converter who only buys ready-made film cannot offer the customisation. At UKHI, the resin is manufactured in-house under the EcoGran™ brand, and this is what allows the finished bag to be tuned for a specific weight, thickness, or clarity requirement.
Customisation
An eco-friendly courier bags manufacturer should offer different material blends (PBAT-led, PLA-led, or starch-based), multiple sizes, and digital printing for smaller runs of 500 to 1,000 units.
Willingness to Run a Trial
Sustainable mailer bags for D2C brands need to survive courier routes. A compostable mailer bags manufacturer in India who is confident in their product will support a pilot run of 5,000 to 10,000 bags across real shipments before the buyer commits to a large order.
What Specifications Matter When Buying Compostable Mailer Bags
Four specifications matter most for compostable courier bags wholesale buyers in India.
Material Composition
Most high-strength mailers use a PBAT-led blend. PBAT gives the bag flexibility and tear resistance. Adding PLA increases stiffness and improves how well the bag holds print. Starch-based blends cost less but are more sensitive to moisture, which matters in humid Indian conditions.
Micron Thickness
The right thickness depends on what is being shipped:
| Micron Range | Best Suited For |
| 60 to 80 microns | Garments, soft accessories, lightweight goods |
| 90 to 120 microns | Shoes, boxed products, return shipments |
Choosing a thicker bag than needed wastes material and money. Choosing a thinner bag than needed leads to torn shipments and customer complaints.
Physical Performance
Before placing a bulk order, the buyer should request a Technical Data Sheet and test samples for tear resistance, puncture resistance, seal strength, water resistance, and barcode readability. These are the properties that decide whether biodegradable mailer bags for ecommerce will perform as expected up on sorting belts and long-haul transit.
Shelf Life and Storage
Compostable materials are hygroscopic, which means they absorb moisture from the air. A typical shelf life is 9 to 18 months if stored in a cool, dry warehouse. Suppliers should provide clear storage guidelines in writing.
Which Materials and Manufacturing Processes Are Used for Compostable Mailer Bags
Materials
Almost all compostable and biodegradable mailer bag manufacturers in India work with the same family of raw materials, though the exact blend varies.
The primary polymers are PBAT and PLA.
PBAT provides flexibility and tear strength. PLA adds stiffness and printability.
A common industrial blend is 70% PBAT and 30% PLA, with additional fillers to fine-tune stretch and strength.
In cost-sensitive formulations, TPS (thermoplastic starch) derived from corn or potato starch is added.
For printing, water-based inks are used, since they contain very few volatile organic compounds and do not interfere with the composting process.
Process
The manufacturing sequence has three stages.
- The pure resins are combined in a twin-screw extruder in a step called compounding. This produces modified granules with the exact properties required. At UKHI, this compounded resin is what is sold as EcoGran™.
- The granules are melted and blown into film through blown film extrusion, using ABA three-layer co-extrusion so that the outer layers can be optimised for appearance and print while the core layer carries more filler.
- The film rolls are printed if required, then heat-sealed and cold-cut into the final mailer shape.
Certifications and Compliance to Look for in a Compostable Mailer Bag Manufacturer in India
Certification is the single biggest area where buyers get misled, so it deserves careful attention.
CPCB Certification
CPCB certification is mandatory. Any compostable and biodegradable mailer bag manufacturers selling CPCB certified compostable bags must have a current certificate on file. There is an important distinction here: a provisional certificate, valid for six months, is issued on the basis of interim 180-day test reports. A final certificate is granted only after the complete tests, including seed germination and heavy metal analysis, are done.
IS/ISO 17088
Bags must be tested at authorised facilities like CIPET to confirm they disintegrate and biodegrade without leaving toxic residue.
Mandatory QR codes
QR codes must appear on each bag and be linked to the manufacturer’s details and valid CPCB number.
State-level Consents
The compostable and biodegradable mailer bag manufacturers must also hold valid Air and Water consent orders and a registration certificate from the relevant State Pollution Control Board.
International Standards
International standards matter if the buyer is exporting. EN 13432 (Europe), ASTM D6400 (USA), or BPI certification cover global compliance.
UKHI’s mailer bags are CIPET-tested and comply with IS/ISO 17088. The manufacturing operation is covered by ISO 9001 for quality management, ISO 14001 for environmental management, and GMP certification.
How Much Do Compostable Mailer Bags Cost in India
Pricing for compostable shipping bags india depends on order volume, material blend, thickness, and print requirements.
The 2026 wholesale benchmark for certified compostable mailers is roughly ₹120 to ₹130 per kg at the raw resin level, though finished bag prices on marketplaces range from ₹150 to ₹350 per kg for plain versions and up to ₹370 per kg for printed ones.
Per-piece rates fall to between ₹2.10 and ₹7 at volumes around 10,000 units. Small retail packs of 50 or 100 bags cost significantly more per bag.
The more useful way to think about cost, though, is per bag rather than per kg.
A lighter bag made from a slightly more expensive resin can still work out cheaper per shipment. Here is the comparison for a standard 12″ x 15″ garment mailer:
| Spec | Conventional Plastic Bag | UKHI Compostable Bag |
| Thickness | 120 micron | 20 micron |
| Weight per bag | 32 grams | 7 grams |
| Cost per kg | ₹150 | ₹300 |
| Bags per kg | 30 | 150 |
| Cost per bag | ₹5.70 | ₹2.28 |
The compostable bag costs twice as much per kg, but because it is thinner and lighter, each bag ends up about 60% cheaper. For wholesale biodegradable shipping bags buyers in India, this can mean substantial savings.
Why Buy Compostable Mailer Bags from UKHI
UKHI is a material science company that engineers compostable biopolymers as drop-in replacements for petroleum-based plastics.
Our resin is manufactured in-house under the EcoGran brand, and the finished mailer bags are produced from that same resin. This granule-to-bag control is what allows the cost and specification advantages shown above.
Existing UKHI customers include Reliance Retail, Amazon, Good Earth, V-Mart, Aditya Birla Group, and Dohful.
The technology is backed by IIT Mandi Catalyst and IIMB NSRCEL.
For end-of-life, UKHI runs the EcoGran Circular Care Programme, which helps brands map their packaging waste, arrange collection, and route it to industrial composting facilities. A next-generation home-compostable material called EDHA™ is currently in pilot development.
Buyers can request a free sample of UKHI compostable mailer bags, shipped within 7 days at no cost, before placing a bulk order.
FAQs
What is the difference between compostable and biodegradable mailer bags?
All compostable bags are biodegradable, but not all biodegradable bags are compostable. Compostable bags break down into water, carbon dioxide, and biomass within a defined time under composting conditions, and leave no toxic residue. “Biodegradable” alone has no fixed time or residue standard in Indian law.
How can a buyer check if a compostable mailer bag is genuinely CPCB certified?
Scan the QR code printed on the bag. It should resolve to the manufacturer’s name, plant address, and a valid CPCB certification number. The buyer can then cross-check that number against the public list of certified manufacturers on the CPCB website.
Are compostable courier bags legal under India’s plastic ban?
Yes. Certified compostable courier bags that meet IS/ISO 17088 and carry a valid CPCB certificate are legally accepted alternatives to conventional poly mailers under India’s Plastic Waste Management Rules.
How long do compostable mailer bags take to break down?
In industrial composting conditions, certified compostable mailers break down within 90 to 180 days. In open landfill or soil, the process takes considerably longer and is not guaranteed.
Can compostable mailer bags be custom printed with brand logos?
Yes. Most compostable and biodegradable mailer bag manufacturers in India offer flexographic printing for large runs and digital printing for smaller ones.
