Kraft paper sack
Paper-based construction; may use multiple plies and, where required, a suitable liner or barrier. Confirm strength, moisture needs and food-contact suitability with the supplier.
See the pack first
Two common sack directions, made easier to compare
Start with the physical package, then explore how the materials and artwork work together. These Briandcas-branded visuals are illustrative concepts, not approved production specifications.
Woven polypropylene sack
Woven fabric provides strength; optional lamination or an inner liner may be considered for print quality or additional moisture management. Validate the full structure and seals.
Important: printed branding in these concept images is an approximation. Use the official Briandcas SVG logo in final artwork, and have the packaging converter confirm dimensions, seams, material layers and print template before production.
Paper Packaging · Technical GuideKraft & Multiwall Paper Sacks
Kraft & Multiwall Paper Sacks
Explained.
Paper sacks built from one or more paper plies, sometimes combined with liners or functional layers for demanding dry-product handling. Kraft sacks use kraft paper as a principal paper component. Multiwall sacks use multiple plies arranged to meet strength, filling and handling requirements. They are used for a wide range of dry goods, but their performance depends on paper grades, ply layout, seams, closure method, and any liner—not simply the word “kraft”.
Schematic only; not to scale. Final material construction, dimensions, seals, closures and print zones must come from the selected packaging converter.
01 / Anatomy & construction
What is this format?
Kraft sacks use kraft paper as a principal paper component. Multiwall sacks use multiple plies arranged to meet strength, filling and handling requirements. They are used for a wide range of dry goods, but their performance depends on paper grades, ply layout, seams, closure method, and any liner—not simply the word “kraft”.
Key components
- Outer ply
Often the main print surface; grade and surface quality influence print and handling. - Inner plies
Additional layers can contribute to strength and resistance to damage. - Side seam / pasted seam
Joins the tube or sack body; seam position may affect the print panel. - Top and bottom closures
May be pasted, stitched, pinch-bottom or another construction depending on equipment and product. - Optional liner
Can support selected barrier needs if properly specified and compatible with the complete pack.
Design principle: build the artwork around the real pack construction, not the other way around. Folds, seals, fitments and machine requirements can change the printable area.
02 / Materials & structure
What is it made from?
Common component roles are described below for learning. They are not a recommended bill of materials for every product or supplier.
| Component / layer | Typical role and specification questions |
|---|---|
| Kraft paper plies | Selected for tensile strength, stiffness, porosity and print requirements. |
| Optional film or barrier component | May address selected moisture or contamination risks; requires end-of-life and compliance review. |
| Adhesive / stitching | The joining method contributes to the overall integrity and must suit filling and handling. |
Important: a pack’s performance depends on the complete converted structure, including seams, folds, seals, fitments, thickness, process settings and storage conditions. Ask the converter for supporting technical data and product-specific validation.
03 / Applications & trade-offsPROTECTION PRODUCTION USE & DISTRIBUTION
Where is it used?
Flour, grain, animal feed, minerals, construction powders and other dry bulk products, when the specific sack design is appropriate.
Potential advantages
Can be configured for different loads; large printable faces; paper-based structure; can be compatible with automated filling systems when designed for them.
Trade-offs to consider
Moisture resistance is construction-dependent; dust, seam failure and puncture risk must be managed; not every sack is suitable for food contact.
Define the product’s sensitivity to moisture, oxygen, light, aroma, contamination, impact or leakage where relevant.
Confirm filling equipment, speed, sealing method, machine compatibility, pack orientation and expected production volume.
Consider transport, stacking, shelf presentation, opening, carrying, reclosure and local end-of-life realities.
04 / Artwork & prepress
Designing for the real pack
Request a sack drawing that identifies the front/back, side seam, valve or open mouth, closure and any no-print zones. Plan for batch coding and required safety/handling statements where relevant.
Pre-production checklist
- Confirm product density, target mass and filling speed.
- Specify paper grades/plies and whether a liner or coating is required with the converter.
- Confirm sack style: open-mouth, valve, pasted, stitched or other.
- Validate drop, compression, stacking and moisture conditions as appropriate.
- Obtain the manufacturer’s approved print template before artwork production.
Artwork handover: request the approved dieline or panel drawing, print specifications, colour guidance, technical layer instructions and proofing procedure from the supplier. Never assume a generic template is production-ready.
Read the full artwork & prepress guide ↗05 / Common questions
Frequently asked questions
Does more plies always mean a stronger sack?
Not necessarily. Paper grades, ply orientation, seams, closure and conversion quality all contribute to performance.
Are kraft sacks always recyclable?
Do not assume this. Liners, coatings, contamination and local recovery infrastructure can affect end-of-life options.
Can these sacks be used for food?
Only when the full structure, manufacturing controls and applicable food-contact requirements are suitable for the intended product.
This guide is educational and is not a substitute for packaging engineering, product testing, food-contact review or current regulatory advice. Confirm applicable Kenyan and destination-market requirements with the responsible product owner and qualified specialists.
Need packaging artwork for this format?
Share the product, target pack size, filling method, reference images and converter specification. Briandcas can help scope the design and prepress requirements.