PE and BOPP laminated woven polypropylene sacks for moisture-sensitive products — supplied across Canada from our Ontario warehouse and on custom production runs.
Plain woven polypropylene is strong, but it is not a barrier. The fabric is made from flat tapes woven over and under each other, and between those tapes are gaps. Moisture vapour passes through them, fine powder sifts out through them, and in a humid warehouse the product inside a plain woven sack is effectively exposed to ambient conditions.
Lamination closes those gaps. A film layer is bonded to the woven fabric so the sack stops being a mesh and starts being a barrier. That single change is what makes woven PP usable for cement, fertilizer, sugar, flour, resin and anything else that reacts badly to humidity or escapes through a weave.
This page covers the two laminations that matter in practice, how to choose between them, and what to specify when you ask for a quote.
These get confused constantly, including by people who have been buying bags for years. They are not alternatives. They sit on opposite faces of the fabric and solve opposite problems.
| PE inner lamination | BOPP outer lamination | |
|---|---|---|
| Where | Inside face, against the product | Outside face, facing the world |
| Job | Moisture barrier and sift-proofing | Print surface, gloss and scuff resistance |
| Typical thickness | 15–40 microns extruded PE | 18–25 microns BOPP film |
| Choose it when | Product is hygroscopic, fine, or stored in humidity | The bag is a retail or brand-facing pack |
| Does not help with | Appearance or print quality | Moisture ingress — it is on the wrong side |
Plenty of specifications call for both: PE inside for the barrier, BOPP outside for photographic print. That is a double-laminated bag, and it costs accordingly. If your product is not moisture-sensitive and the bag is not brand-facing, you may need neither.
Barrier performance is measured as moisture vapour transmission rate — MVTR — in grams per square metre per 24 hours, at a stated temperature and humidity. Lower is better. The number is meaningless without the test conditions, so always ask for both.
A PE-laminated woven PP bag typically sits below 5 g/m²/24h at 38 °C and 90 % RH. Plain woven fabric does not have a meaningful MVTR figure at all, because it is not a barrier — air moves through it freely.
Where a laminated bag is not enough, the next step is a separate PE liner inside the sack. A liner gives a higher barrier than lamination and can be specified food-grade independently of the outer bag. For long storage of highly hygroscopic product, or where the product must not contact the woven fabric at all, a liner is the right answer rather than a heavier laminate.
Food-contact is a documentation question before it is a materials question. Woven polypropylene and polyethylene are both widely used in food packaging, but "it is PP, so it is food safe" is not a position you can defend to an auditor.
What you should be asking for, and what we will provide:
If your own HACCP plan or FSSC audit has specific documentary requirements, send them with your enquiry. It is far easier to specify against them up front than to retrofit paperwork to an order already in production.
The fastest route to an accurate quote is to tell us these six things. Buyers who send all six usually get a usable number first time.
| Specify | Why it changes the answer |
|---|---|
| Product and fill weight | Drives fabric weight, bag dimensions and whether lamination is needed at all |
| Bag dimensions (W × L cm) | Or give us fill weight and bulk density and we will work it back |
| Lamination | PE inner, BOPP outer, both, or none |
| Liner | Required or not — changes the barrier conversation entirely |
| Number of colours, or none; print drives the outer laminate choice | |
| Filling method | Hand-fill, open-mouth auto, or valve — determines the top construction |
We supply laminated woven polypropylene bags to food processors, construction material producers, chemical blenders and agricultural packers across Canada and into the USA, shipping from our Ontario warehouse by LTL or full truckload. Custom-laminated and printed runs are produced to your specification, so they carry both a longer lead time and a minimum production quantity, confirmed with your quote.
Prices are quoted per order. Delivery is not included and is quoted per order, because freight to a site in Ontario and freight to one in British Columbia are not comparable costs.
Available Sizes
Click any size below for full specifications, or request a custom size.
All specifications are fully customizable. Contact us to discuss your exact requirements.
| Material | Woven Polypropylene (PP) with film lamination |
|---|---|
| Base Fabric Weight | 55 – 110 GSM |
| PE Inner Lamination | 15 – 40 microns extruded polyethylene |
| BOPP Outer Lamination | 18 – 25 microns biaxially oriented polypropylene |
| Total Bag Weight | 80 – 160 GSM (fabric + lamination) |
| Dimensions (W × L) | 35 × 60 cm to 60 × 105 cm |
| Load Capacity | 10 – 50 kg |
| MVTR (PE laminated) | < 5 g/m²/24h (at 38°C, 90% RH) |
| Printing (BOPP surface) | Up to 8-colour rotogravure or 6-colour flexographic |
| Food Grade | CFIA and FDA compliant options available |
PE-laminated bags are essential for flour mills, sugar refineries, and food ingredient processors packing hygroscopic products that absorb moisture from ambient air. The continuous PE film prevents moisture ingress that causes caking, clumping, and microbial growth. Food-grade lamination from virgin PE meets CFIA and FDA requirements for direct food contact, protecting both product integrity and regulatory compliance.
Cement and dry-mix products are extremely moisture-sensitive — even minor humidity exposure causes premature hydration and product failure. PE-laminated PP woven bags are the standard packaging for Portland cement, plaster, tile adhesive, and self-levelling compound across the Canadian construction supply chain. The laminated barrier maintains product viability through warehouse storage, truck transport, and outdoor job site conditions.
Road salt, pool salt, water softener salt, and industrial chemicals packed in laminated bags resist moisture absorption and caking during seasonal storage. Laminated bags also prevent fine powder products from dusting through the fabric weave, reducing product loss and keeping pallets, warehouses, and retail displays clean. Double-laminated bags with BOPP exterior add brand visibility for retail salt and chemical products.
More Products
Heavy-duty bulk containers from 500–2,000 kg. ISO 21898 tested, available in standard and custom configurations.
Learn More →UV-stabilized woven polypropylene sleeves and rolls for protecting wood products during storage and transport.
Learn More →Bespoke dimensions, specialty printing, and unique configurations engineered to your exact specification.
Learn More →Custom-sized and printed laminated runs, with artwork and pre-press support.
Learn More →Photographic-quality printed woven PP for retail and brand-facing packs.
Learn More →PE (polyethylene) lamination is applied to the inner surface of the bag to create a moisture and vapour barrier. It is a continuous film that seals the micro-pores in the woven fabric. BOPP (biaxially oriented polypropylene) lamination is applied to the outer surface to provide a smooth, glossy print surface and improve puncture resistance. PE lamination is functional (moisture protection), while BOPP lamination is primarily visual (print quality) with secondary mechanical benefits.
Yes. Double-laminated bags with PE inner and BOPP outer are a common specification for products that require both moisture protection and premium retail graphics. This is the standard configuration for consumer flour, specialty rice, pet food, and branded construction products. The combined lamination adds approximately 35–65 microns of film to the base fabric weight.
Laminated PP bags are more complex to recycle than uncoated bags because the lamination film must be separated from the woven base during processing. However, PE and BOPP are both polyolefin materials compatible with PP recycling streams, and many industrial recyclers accept laminated PP bags. Sackora can provide guidance on recycling options available in your region and help specify the minimum lamination thickness needed for your application to reduce material usage.
If your product absorbs moisture from the air (is hygroscopic), generates fine dust that could escape through woven fabric, or requires a specific moisture content at point of use, PE inner lamination is recommended. If your product is sold at retail and requires high-quality branded packaging, BOPP outer lamination is recommended. Products like cement, flour, sugar, and salt almost always require PE lamination. Sackora can test your product's moisture sensitivity and recommend the appropriate lamination specification.
MVTR stands for Moisture Vapour Transmission Rate — the rate at which water vapour passes through the bag material, measured in grams per square metre per 24 hours. Uncoated woven PP has a relatively high MVTR because moisture can pass through the micro-gaps between woven tapes. PE lamination reduces MVTR to below 5 g/m²/24h, which is sufficient for most moisture-sensitive products. Lower MVTR means better shelf life and fewer quality issues related to moisture absorption during storage and transport.
They sit on opposite faces and do different jobs. PE goes on the inside against the product and provides the moisture barrier and sift-proofing — typically 15–40 microns of extruded polyethylene. BOPP goes on the outside and provides the print surface, gloss and scuff resistance — typically 18–25 microns. They are not alternatives; a bag that needs both a barrier and photographic print is double laminated.
Only if your product takes up moisture from the air, cakes, or is fine enough to sift through a weave — or if the bag is brand-facing and needs print quality. For a bulk industrial product going straight into a process, plain woven is often correct and lamination is money spent on nothing. Tell us the product and we will say honestly which way it falls.
A PE-laminated woven PP bag typically sits below 5 g/m²/24h MVTR at 38 °C and 90 % RH. The test conditions matter as much as the number, so always ask for both. Plain woven fabric has no meaningful MVTR figure because air moves through the weave freely.
When you need a higher barrier than lamination gives, when the product must not contact the woven fabric at all, or when the product is highly hygroscopic and will be stored a long time. A liner can also be specified food-grade independently of the outer bag, which simplifies documentation in some audits.
Yes, with the right documentation. Ask for food-contact material compliance against US FDA 21 CFR §177.1520 and the corresponding Health Canada requirements, production in FSSC 22000 facilities with the certificate referenced against the facility running your order, a declaration of compliance covering the finished bag rather than only the raw material, and separate documentation for any liner. "It is PP, so it is food safe" will not satisfy an auditor.
No — lamination closes the fabric, not the stitching. A laminated bag with ordinary seams can still leak fine powder at the seam line. If you are packing something fine, specify the seam construction alongside the lamination; the two have to be solved together.
Yes. BOPP outer lamination exists largely to carry high-quality print, and supports photographic reproduction with multiple spot colours. Flexographic print directly onto laminated woven fabric is also possible where the requirement is simpler. Tell us the number of colours and whether the artwork is photographic and we will recommend the route.
Six things: the product and fill weight, bag dimensions (or fill weight plus bulk density and we will work it back), which lamination you want, whether a liner is required, print requirements, and the filling method — hand, open-mouth automatic or valve. Enquiries with all six usually get a usable number first time.
Get a fast, no-obligation quote. We typically respond within 24 hours.
