| Dimension | Muslin | Canvas |
|---|---|---|
| Weave and weight | Light, open plain weave. Soft in the hand and semi-opaque when held to light. | Heavy, tightly woven plain or duck weave. Opaque, stiff and substantially heavier per unit area. |
| Structure | Drapes. A filled muslin bag takes the shape of its contents, which is what you want for small items and drawstring closures. | Holds its shape. A canvas bag stands on its base empty, which is what a tote or a reusable carrier needs. |
| Printing | Takes screen print and heat transfer cleanly. Fine detail can spread slightly on a looser weave, so type is kept above hairline weight. | Tighter surface holds finer detail and heavier ink coverage. Also the practical choice for embroidery, which needs a substrate with body. |
| Durability in use | Sized for protection and presentation rather than load. Repeated heavy loading will distort the weave over time. | Built for repeat handling and load. The usual specification when the bag is the product the customer keeps and reuses. |
| Typical use | Jewelry, gift, cosmetic and small-item packaging; herb, tea and bath-product bags; inner bags inside a rigid box. | Retail totes, promotional carriers, shoppers and structured zip pouches. |
| What it is called | Muslin in the US. Calico in the UK and Australia — the same cloth, so a quote should state weight rather than rely on the name. | Canvas everywhere, though 'duck' appears for the heavier, tighter grades. Weight is again the number that matters. |