Our Products
BioSak Compostable Bags & Film

W. Ralston is the original pioneer in the development of the new and growing market for certified compostable bioplastics in Canada. In recognizing that the marketplace was demanding new solutions for food waste disposal management, we were the first Canadian company to produce certified compostable bags. This material, marketed under the Biosak brand, facilitates the collection of organic waste and is now sold through traditional retail outlets from coast-to-coast.

We have also launched an industrial line of Biosak bags, packed in large quantities, for use in the growing Institutional, Commercial and Food service marketplaces.

All these compostable products are certified by both Canada’s BNQ certification program and by the BPI Biodegradable Product Institute. Biosak meets all the requirements of ASTM D6400-04 and the BNQ 0017-088.

2100 SERIES Biosak® Bulk Compostable Bags

The Original Biosak® 100% Compostable Green Bags Certified by BPI ASTM 6400 and BNQ 0017-088. Printed with Biosak logo and all certifications.  Stock sizes to fit most containers.  Custom sizes available.

Biosak® Retail Compostable Bags

The Original Biosak® 100% Compostable Brown Bags for Residential Kitchen & Curbside Organics

Tips on Using BioSak

  • We have been working with retailers and your local municipality to help promote the green bin program in your community. Your participation in the green bin program is vital to the successful diversion of waste from landfill.
  • This information is intended to help you to understand the performance characteristics of our BIOSAK® Compostable Bags for Kitchen Waste.
  • It is important to recognize that these bags are not intended to duplicate the performance of a regular plastic bag. They are Certified Compostable Plastic products designed to line the green bins and containers to help keep those containers clean. The final goal is for the bags to become compost.
  • Your municipality requires that you use only Certified Compostable bags that carry this approved symbol of compostable certification.
  • Beware of imitation
  • You will find the symbol printed on our bags and the packaging they are sold in.
  • Other so called biodegradable or compostable bags do not break down into compost. Those non-certified bags contaminate the compost with plastic film, reducing the value and useful applications for the compost.
  • If the packaging and bags are not printed with the certification, then the bags are not compostable and are not approved for use in your municipality.
  • Our BIOSAK® Compostable Bags are made with a new generation of BIO-PLASTIC derived from corn, a renewable resource. Our BIOSAK® Compostable Bags are made with a new generation of Mater-Bi® BIO-PLASTIC. Mater-Bi® is the first family of bioplastics that use vegetable components, such as cornstarch, that have been modified (or complexed) with biodegradable polyesters.

Tips for Kitchen Organics

How to Remove and Replace the bag in the Kitchen Container

Use Biosak 0503-03

Use Biosak 0503-03

Use Biosak 0505-03

  1. With the bag still in the container, tie the top of the bag securely. (This will trap odors and insects inside the bag and keep other insects from getting into the bag)
  2. Do not carry the bag by the knot. Instead, carry the container with the bag and contents to your curbside bin.
  1. Gently remove the tied bag with contents from the kitchen container and place it into the curbside bin.
  2. Rinse the inside walls and lid of the kitchen container.
  3. Put a fresh bag into the kitchen container.a

Tips for Curbside Organics

How to keep the Curbside Container clean

Use Biosak 0506-03

Use Biosak 0507-03

Use Biosak 0505-03

  1. Many residents prefer to line their curbside container to keep it clean.
  2. Simply inserting the BIOSAK # 506-03 or #507-03 into the curbside container can do this. These bag are specially designed to fit the curbside containers.
  3. Place loose or bagged kitchen waste into the curbside container.
  1. On collection day, securely tie the top of the bag. This will allow the bag and its contents to be tipped out into the collector’s truck. The contents will be held inside the bag, odor and insects will be reduced at the time of collection and the container will be free of food residue.


Are BIOSAK Bags Compostable?

Yes, BIOSAK bags will completely compost quickly and safely. They have been awarded the “Compostable Logo” by the Biodegradable Products Institute (BPI). BIOSAK bags meet ASTM D6400 specifications for Compostable Plastics.

BPI  Compostable

Where are BIOSAK Bags manufactured?

BIOSAK bags are Proudly Canadian manufactured by W. Ralston (Canada) Inc. Brampton, Ontario and in Drumheller Alberta, Canada

What is a BIOSAK Bag made from?

BIOSAK bags are manufactured using Mater-Bi® resins, the first family of bioplastics that use vegetable components, such as corn starch, that have been modified (or complexed) with biodegradable polyesters.

Is BIOSAK used anywhere else in the world?

Yes, Novamont’s Mater-bi resins have been used in Europe under different brand names for over ten years. There are over 3,000 European communities using bags manufactured with the same technology as BIOSAK.

What is the shelf life of BIOSAK Bags?

The life depends on storage conditions, but in general BIOSAK bags maintain useful properties for a couple of years under room temperature/humidity conditions.

Is BIOSAK available in colours?

Yes, BIOSAK bags can be manufactured in a complete range of colours, minimum quantities are required.