Canvas is the fabric people reach for when something has to last: tote bags carried every day, aprons in busy kitchens, work jackets on building sites. It is also one of the most loosely used words in textiles, and “duck canvas” adds to the confusion. Here is what each term actually means and how to specify the right one.
What canvas is
Canvas is a heavy, tightly woven plain-weave fabric. Each weft yarn crosses over and under one warp yarn, the same basic structure as poplin, but with much thicker yarns, often plied, packed closely together. The result is a dense, stiff, hard-wearing cloth.
- Fiber: traditionally 100% cotton; also cotton/polyester blends such as CVC, linen, and synthetic canvases in polyester or nylon.
- Weight: usually 220–450 gsm (about 6.5–13 oz/yd²) for apparel and bags, and heavier for tents and industrial covers.
- Character: strong, abrasion-resistant and stable, with a natural, matte surface that softens and ages with use.
Canvas vs duck canvas
“Duck” comes from the Dutch word doek, meaning cloth. Duck canvas is a type of canvas, not a different fabric. The difference lies in how tightly it is woven:
| Canvas (plain or standard) | Duck canvas | |
|---|---|---|
| Weave | Plain weave, sometimes basket weave | Plain weave, very tightly woven |
| Surface | Coarser, more visible yarn texture | Smoother, flatter and more uniform |
| Yarns | Often heavier plied yarns | Fine to medium yarns packed very densely; some types use doubled warp yarns |
| Feel | Stiff, rugged, rustic | Dense, firm, slightly smoother hand |
| Typical uses | Tents, tarps, art canvas, upholstery, bags | Work jackets and pants, aprons, tool bags, totes, footwear |
In the US market you may also see numbered duck (No. 1 to No. 12, where lower numbers are heavier) and army duck (made with plied yarns in both directions for extra strength). These grades vary between mills, so always confirm the actual weight in gsm or oz/yd² rather than relying on the name.
Canvas weights explained
Canvas is often sold by ounces per square yard. Multiply oz/yd² by 33.9 to get gsm (see our GSM guide).
| Weight | Approx. gsm | Typical use |
|---|---|---|
| 7–8 oz | 240–270 | Lightweight bags, casual jackets, shoes |
| 10 oz | 340 | Tote bags, aprons, work shirts and jackets |
| 12 oz | 405 | Work pants, heavy aprons, tool bags |
| 14–18 oz | 475–610 | Heavy-duty workwear, covers, tents |
Heavier is not always better: a 10 oz duck is often the best balance of durability and comfort for apparel, while bags and covers can go heavier.
Finishes that change what canvas can do
- Pre-shrinking (sanforizing): controls shrinkage so garments and covers keep their size after washing.
- Water-repellent (DWR): makes water bead on the surface; our DWR is PFAS-free (see PFAS-free water repellency).
- Wax finish: the classic waxed-canvas look for bags and jackets, with good water resistance.
- PU or PVC coating: makes canvas waterproof for covers, tarps and bags.
- Flame-retardant finish: for workwear and tents that must meet FR requirements; see our FR workwear fabric.
- Soft, enzyme or washed finishes: for a broken-in hand on fashion and workwear pieces.
- Stiff finish: for bags and structured items that should hold their shape.
Is canvas waterproof?
Plain cotton canvas is water-resistant at best. Its tight weave sheds light rain, and cotton fibers swell when wet, closing gaps further, which is why old canvas tents worked. For reliable performance:
- Water-repellent or wax finishes for bags, aprons and jackets that face rain and spills.
- Coated or laminated canvas for covers, tarps and anything that must stay dry; specify a water-column target in mm.
Canvas vs twill for workwear
Both are classic workwear fabrics. Canvas and duck (plain weave) give a stiffer, flatter, more abrasion-resistant face, ideal for chore coats, aprons, tool bags and reinforced work pants. Twill (a diagonal weave) drapes and moves better and is the usual choice for everyday work trousers and uniforms. See cotton twill and T/C workwear twill for comparison.
How to specify canvas
- Fiber: 100% cotton, CVC or another blend
- Weight in gsm or oz/yd², with tolerance, and cuttable width
- Plain canvas or duck, and the yarn type if you need plied yarns
- Finishes: pre-shrunk, water-repellent, wax, coating, FR, soft or stiff hand
- Color standard and the colorfastness level your end use needs
Custom canvas and duck canvas from Yongbo Textile
Yongbo Textile weaves and finishes canvas and duck canvas to your specification:
- Fiber: 100% cotton, CVC and other cotton-rich blends
- Weight and construction: from about 220 to 450 gsm, standard canvas or tightly woven duck, with yarn count and density set to your end use
- Finishing: pre-shrinking, PFAS-free water repellency, wax finish, coating, flame retardancy, soft or stiff hand
- Color: piece-dyed solids matched to your standard, in-house on our own dyeing lines
- Beyond fabric: finished aprons, work jackets and pants through our one-stop garment service
Standard MOQ is 1,500 meters per color, and smaller runs are possible at a higher unit price. See our cotton canvas page, or send us your sample or spec and we’ll analyze it and quote. 🌐 yongbotex.com
Frequently asked questions
What is canvas fabric?
Canvas is a heavy-duty plain-weave fabric with a tight, dense construction, traditionally made from cotton and now also from cotton blends and synthetics. It is valued for its strength, stiffness and abrasion resistance.
What is the difference between canvas and duck canvas?
Duck canvas is a subtype of canvas. It is woven more tightly and has a smoother, flatter surface than plain canvas, which often has a coarser, more visible texture. Both are plain weaves; duck is the denser, more uniform version commonly used for workwear and bags.
What does 10 oz canvas mean?
It means the fabric weighs about 10 ounces per square yard, roughly 340 gsm. Multiply oz/yd² by 33.9 to convert to gsm.
Is canvas fabric waterproof?
Untreated cotton canvas is not waterproof, although its tight weave sheds light rain. Water-repellent finishes and wax improve resistance; PU or PVC coating or lamination makes it waterproof.
What is duck canvas used for?
Duck canvas is used for work jackets, work pants and bib overalls, aprons, tool bags, tote bags and backpacks, footwear uppers and covers, where a dense, durable face matters.
Is canvas the same as twill?
No. Canvas is a plain weave with a flat, even surface. Twill has a diagonal rib and a softer drape. Both are used for workwear: canvas for stiffer, more abrasion-resistant pieces, twill for trousers and jackets that need more movement.