Stack strength
Multiple paper plies and a block bottom create a stable bag that holds its shape under pallet loads.
2–5 ply kraft paper
Multi-Layer Paper Valve Bags
Multiwall paper valve bags are built from two to five layers of sack kraft paper, with a valve that fills cleanly on high-speed packers. They are the classic choice for cement, dry mortar, gypsum, flour and other free-flowing powders that need stack strength and a premium print surface.
2–5 plies70–90 g/m² per ply15–50 kgKraft or white
Samples 7–10 working days · MOQ from 5,000 pcs
04
2–5 ply kraft paper
Valve
Self-closing
Matched to your spout
2–5Paper plies
70–90 gsmPer ply
15–50 kgFill weight
HighStack strength
Overview
2–5 ply kraft sacks for cement, mortar and powders.
Multiwall paper bags are built from 2–5 plies of sack kraft. Ply count, paper grade and valve are selected together to match the fill weight, stacking height and filling line — then confirmed with a sample before production.
Premium print surface
Smooth kraft or white paper takes sharp, matte print — ideal for cement, mortar and retail-facing brands.
Breathable or coated
Paper naturally releases air and moisture. Coatings, liners and PE-free options can be added for barrier or recyclability goals.
Construction
What goes into the bag.
Each layer has a job: strength, barrier, print or product contact. We specify them together so the bag performs as one structure, not a stack of materials.
Custom builds are normal. Thickness, ply count, coating and valve can be adjusted after a sample trial. Send the product data sheet and we will propose a starting structure.
01
Outer plyKraft paper, 70–90 g/m²
Print surface, stiffness, tear resistance
02
Middle pliesKraft paper, 70–90 g/m²
Strength, puncture resistance, stacking
03
Inner plyKraft paper or coated paper
Product contact, moisture control
04
ValvePaper valve sleeve
Clean filling, self-closing
Specification options
Set the parameters that matter to your line.
These are the ranges we work with most often. Final dimensions and material weights are confirmed against your fill weight, product density, filling speed and pallet pattern.
ParameterStandard rangeNotes
Plies
2–5 plies
Set by fill weight and handling
Paper
Brown or white sack kraft, 70–90 g/m²
Food-grade and wet-strength grades on request
Bag size
Width 180–600 mm; length 300–1,000 mm
Custom gusset and bottom
Valve
Internal sleeve or pasted valve
Matched to your packer
Printing
Flexo, up to 4 colours
Clean, matte finish
Barrier
Coated ply, PE liner or PE-free barrier
For humidity-sensitive products
Matching an existing bag? Send a physical sample or a dimensioned drawing. We measure the bag, valve and print layout and confirm the matched specification before sampling.
Recommended for
Where this bag earns its place.
Multi-Layer Paper Valve Bags are usually specified for the applications below. If your product is not listed, the same structure may still fit — the deciding factors are moisture sensitivity, bulk density and filling method.
See all applicationsQuality checks
What we check before shipment.
- 01Paper grammage
- 02Ply bond
- 03Valve fit
- 04Drop test
- 05Stack test
- 06Print adhesion
Test reports, material declarations and batch identification are available on request.
Multiwall paper valve bags FAQ
Specification questions.
Practical answers for buyers comparing structures or matching an existing bag. For product-specific advice, send the details.
Ask about Multiwall paper valve bagsHow many plies do I need for a 25 kg cement bag?
It depends on paper grade, bag dimensions, filling speed and pallet pattern. Three to four plies are common for 25 kg cement, but we confirm the build with a sample and stack trial rather than relying on a rule of thumb.
Can multiwall paper bags be moisture-resistant?
Yes. Coated paper, a PE liner or a PE-free barrier layer can be added. The trade-off is between moisture protection, breathability, recyclability and cost — we can help you choose.
Are paper valve bags suitable for food?
Food-grade kraft paper and liners are available, with declarations on request. Tell us the food category, target market and any grease or moisture requirements.
Do paper valve bags work on high-speed filling lines?
Yes, when the valve, dimensions and paper stiffness match the packer. We ask for your spout type and fill rate so the valve geometry is correct before sampling.
Related range
Compare with another structure.
Request Multiwall paper valve bags
Send the specification. We will price the right build.
Include the product, fill weight, target dimensions, valve type, print colours and quantity. We will respond with a recommended structure, sample plan and quotation.