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255x325mm Compostable Mailing Bag

Product Code: CMB2
Availabilty: In Stock

Our plastic-free mailing bags come with a peel-and-seal strip for easy packing and unpacking. They’re printed with the compostable logo and messaging that shouts loud and clear just how eco-friendly these bags are! 100% compostable and plastic-free.

Order before 1pm for next working day delivery.

From £0.12

Total Cost:
Order by 1pm Monday - Friday for next day delivery

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Home Compostable
Plastic Free
Sustainably Sourced
Verified Carbon Neutral

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Free Next Day Delivery 6 Days a week

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Parcel Tracking

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1-hour Delivery Slot

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Sustainably Sourced

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Box Quantity800
Internal Dimensions255x325mm +50mm flap
Material60micron Cornstarch + PBAT +PLA
ColourBlack with Green Print
End of LifeBiodegradable, Compostable


These 255x325mm compostable mailing bags are best suited for shipping light small, medium and large items. They’re the perfect alternative to plastic mailers — they have the same functionality without the environmental drawbacks of plastic-based packaging. Our mailers aren’t designed to last forever but are guaranteed to get your products from A to B safely, securely and sustainably.

If you’re using plastic mailing bags, our compostable mailers make it easy for your brand to transition to more environmentally friendly packaging. They make a worthy addition to any packaging operation thanks to their versatility and ease of use. They’re supplied with a detachable peel-and-seal closure for easy packing and unpacking (this must be removed before composting).

What Features Do (255x325mm) Compostable Mailing Bags Have?

Peel and seal: The adhesive strip applied to these bags makes it quick and easy to secure your shipments.

Printed: These black mailing bags are printed with eco-friendly water-based inks. The printed message shouts loud and clear about their environmental credentials so all your customers know you’re choosing sustainable packaging.

Storage: These compostable mailing bags can be stored in cartons in a cool, dry warehouse for approximately one year. The recommended storage temperature range is 10-40°C. It is advisable to avoid storing these bags in high temperatures, direct sunlight or a humid environment.

Compostable Mailing Bags with Eco-Friendly Credentials

Our eco-friendly mailing bags stay true to their word — they don’t last forever. Our mailing bags are made from PBAT and PLA derived from cornstarch. These natural compounds are commonly used to create 100% compostable and biodegradable materials. They can be composted in a home environment and a commercial facility (except for the peel and seal strip, which must be removed). In an ideal composting environment, they will biodegrade completely within 90 days. The process will take approximately six months in an ordinary or microbial environment, such as buried in soil.

Packaging Supplies Sustainability Guarantee

At Packaging Supplies, our plastic-free mailing bags — and all of the mailing bags in this range — are 100% compostable and biodegradable. We’re a certified carbon neutral packaging supplier committed to helping other businesses lower their carbon footprint and make more sustainable choices with their packaging.

By selecting an experienced packaging supplier with expertise and experience within many industries, you benefit from packaging that will help maximise storage and reduce transport costs. We can assist in providing the most sustainable packaging solutions.

Eco-Friendly Mailing Bags: Storage and Accreditation

Since these mailing bags are made using organic materials, they will degrade naturally under the right conditions. They need to be stored correctly to prolong their life while not in use. These compostable mailing bags can remain in cartons in a cool, dry warehouse for about a year. Avoid storing these bags in sunlight or at high temperatures. As a rule of thumb, we recommend a storage temperature range of 10-40°C.

We offer a suite of Complete Packaging Services, including storage and inventory management, to help you optimise your packaging operation and let you focus on your business making money. Our storage facilities are BRCGS accredited (Brand Reputation Compliance Global Standards) — our stock is stored in a warehouse that maintains high food-safety standards.

Frequently Asked Questions

Welcome to our FAQs section on recyclable mailing bags! We understand the importance of sustainable packaging and want to provide you with all the information you need to make eco-friendly choices. 

Compostable mailing bags are perfect for non-fragile goods, including small, medium and large items. Use these mailers to ship soft items like clothing and boxed merchandise like shoes or trainers. They’re a great solution for eCommerce businesses looking to transition from plastic mailers to eco-friendly mailers without compromising the quality of their packaging.

Our eco-friendly compostable mailing bags can remain in cartons in a cool, dry warehouse for about a year. Avoid storing these bags in sunlight or at high temperatures, or the degradation process will start sooner than you want it to. We recommend a storage temperature range of 10-40°C, which is highly achievable on most premises. Alternatively, you can use our BRCGS accredited storage facilities (Brand Reputation Compliance Global Standards) to ensure your mailing bags are stored properly.

Yes! These bags can be custom printed with your chosen artwork. Minimum order quantity (MOQ) is 250 bags so you can get customised packaging that’s 100% biodegradable and safe for composting. Looking for a paper-based packaging solution? Check out our custom printed paper bags!

Yes, we offer our compostable mailing bags in four sizes:

Each is available in quantities from 1,000 units to half pallets of 10,000 units or more.

We can offer a suite of Complete Packaging Services, including inventory management and third-party logistics (3PL). If you’re looking to order larger volumes than we offer in our shop or wish to order by pallet on a regular basis, get in touch with one of our representatives today.

Make a sustainable choice for your packaging needs. Explore our eco-friendly mailing bags range today.

Deliveries by Couriers

Courier deliveries will be made between 9am – 6pm.

All deliveries must be signed for unless stated in the special instructions when placing the order.

Please open and fully check the contents of your delivery before signing to confirm receipt.

Tracking your parcels

As soon as your goods leave our premises they are tracked until they reach your door!

We partner with DPD for a reason, they offer the most in flexibility and customer service features. Once your goods are picked up from our depot, you will be notified via either the email addressed you provided or by text message on the telephone number you provide during the order process.

On the day of delivery, you will be given a 1-hour delivery slot, this means that you do not need to be in all day like other couriers. Through the DPD app or website you are able to track the route and name of your driver.

Going to be out whilst the delivery is taking place? No Problem, you can either change the delivery address or even request it be delivered to a local pick up point or store. Many stores including Halfords and Sainsburys support DPD pick-ups.

Click Here to visit the DPD website where you can enter your details. Alternatively, if you have a smart phone, you can download the DPD app from the Apple or Android Store.

Pallet Deliveries

Part-pallet or full pallet deliveries will be despatched through our pallet network or on our own vehicles.  You will be notified by email when your delivery is being despatched, but will be unable to track it online.  All pallet deliveries will be made between 8am - 6pm on the next working day.

International Deliveries

Once your order has been placed a quote for delivery will be generated and you will be contact prior to despatch to make payment.

Delivery Timescale

We aim to process and despatch orders for next business day delivery (subject to stock availability). But please allow 2-3 days for delivery.

Orders placed by 2pm Monday to Friday would normally be delivered next day (Sunday and bank holidays Excluded).  Please note pallet deliveries can only be delivered on a working day with Saturdays excluded.

In the event that the product ordered is out of stock, the customer will be contacted with an estimated delivery date.


UK Bank Holidays

Orders will not be processed during UK public bank holidays. Orders will be processed on the first working day back.

Delivery Charges to UK Mainland Destinations

We are extremely happy to announce that we offer free next day delivery to all orders delivered to UK Mainland, with no minimum order value.

Delivery Charges to Other UK Destinations

Deliveries outside of the UK Mainland, will be subjected to the following charges:

Parcel Rates to Northern Ireland

Pack 1 £5.50 per pack

Pack 2 £10.50 per pack

Parcel Rates to Scottish Highlands & Islands

Pack 1 £3 per pack

Pack 2 £6 per pack

Pallet Rates to Northern Ireland

Part Pallet £30 per part pallet

Pallet £35 per pallet

Pallet Rates to Scottish Highlands & Irelands

Part Pallet £30 per part pallet

Pallet £45 per pallet

For International deliveries, please contact us to check delivery cost before placing your order.

Returns Policy

Damaged or Defective Product Returns

If you have received damaged or defective products, we apologise in advance.  Please follow the guidelines below:

Please call us on the following number 01491 834000 or contact us via [email protected] . within 5 working days of receipt of the goods.  Refunds for damaged or defected goods can only be refunded when returned to Packaging Supplies within 10 working days of your delivery.

Packaging Supplies will arrange collection for any damaged or defective goods, however in the event that you miss your arranged collection date or time, then the return of the goods will become your responsibility.

Items must be made ready for collection with an order confirmation printed inside the parcel.

Standard No-fault Returns

Please call us on the following number 01491 834000 or contact us via [email protected] . within 5 working days of receipt of the goods.

Goods must be returned to Packaging Supplies within 10 working days from the date of your delivery.

You must obtain a collection quote from Packaging Supplies for the return of the items, which will vary in cost depending on the order quantity and size.

Items must be made ready for collection with an order confirmation printed inside the parcel.

Refunds will only be issued if all returned items are unmarked, undamaged and in a new condition with the inner packaging unopened.

Custom-made Product Returns

For damaged or defective products, please follow the advice above.

Refunds or returns for products that have been custom made or customized in any way will not be accepted unless they have been delivered damaged or defective.

Packaging Supplies will assess all custom-made return claims for damaged or defective products on a case by case basis.

Very efficient prompt service - good product and for once a company with a sense on pricing. Will use again.

Very good price, good quality and strong packaging, very good and easy no problem service, constant email updates, delivered when promised.

Brilliant fast delivery, came next day of order, always have what I need for a small upcoming business, so glad they don't make you buy too much, perfect boxes, thank you.

Great Service. Very simple ordering process. And great communication to keep updated on delivery.

Very quick delivery and boxes as described. Will order again for sure.

Easy to navigate website and package delivered next day. Product just what I needed and I would recommend this company.

Always on time and amazing service.

Really good quality my customers love them and I have most sizes now of the self seal brown boxes. I really like that Packaging Supplies is always looking to improve their sustainability too.

Service was fast and communication friendly and responsive.

Arrived quickly and in perfect condition and its great to see every part of the packaging was eco friendly. Will definitely be ordering again.

Great service, fast and exactly what they said they would do.

Fantastic customer service! I had an issue with my delivery and it was dealt with and resolved very quickly. I have used the company on numerous occasions - highly recommended for quick delivery and great products.

Completed all my requests with super fast delivery! Brilliant quality boxes too!

Quality products and fast delivery!

Quick delivery, good quality. Will use again!

Good quality product, great price and super fast free delivery!

Very good service and fast response. Product as described 5/5!

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Expert packaging suppliers for over 40 years, with an emphasis on plastic-free packaging

In the late 1970s, two friends and colleagues, Tim Allen and Stewart Middleton saw a gap in the market for a different type of packaging supplier. At the time, other businesses were selling custom made boxes and stocking packaging consumables, but Tim and Stewart wanted to offer more than that. They wanted to give their clients additional services, such as warehouse storage and the ability to have their packaging delivered as and when it was required. Packaging Supplies was established, and the rest is history.