Cotton Twill Tape Uses in Bag Making
By Klum House: Bag making kits, bag sewing patterns, waxed | Published: 2026-10-27
Category: How-to Guides
Learn how to use cotton twill tape for seam binding, strap reinforcement, and edge finishing in your bag making projects. Practical steps and tips included.
Quick answer
Cotton twill tape is a versatile, heavy-duty binding for bag making. Use it to reinforce straps, bind raw seam edges, and add a clean trim to leather or waxed canvas projects.
Why cotton twill tape works for bag making
Cotton twill tape is woven tightly, so it resists fraying and holds up to the stress of bag straps and handles. Its 1-inch width is wide enough to cover seam allowances but narrow enough to fold neatly around curves.
Unlike bias tape, twill tape has no stretch, which makes it ideal for reinforcing straight seams and strap attachments where you want stability. The trade-off is that it does not conform to sharp curves as easily, so plan straight or gently curved applications.
Choosing the right twill tape for your project
For most bag patterns, a heavy-duty 1-inch cotton twill tape like the one sold by Klum House works well. It is sold in 1-yard increments, so you can buy exactly what you need. The Slabtown Backpack, for example, requires 1.5 yards of cotton twill tape for its binding.
If you are working with lightweight fabric, you can still use cotton twill tape, but consider testing a small piece first to ensure the tape does not overpower the fabric's drape.
How to use cotton twill tape in bag making
- 1. Measure and cut the tape: Lay the tape along the seam or strap you plan to bind, adding 1 inch for overlap at each end. Cut with sharp scissors or a rotary cutter. Common mistake: cutting too short, which leaves gaps at the ends. Always cut a little extra; you can trim after sewing.
- 2. Attach the tape to the seam allowance: Place the tape centered over the raw edge of the seam allowance, right side up. Pin or use double-sided leather tape to hold it in place. Sew close to the edge of the tape, using a straight stitch (3–3.5 mm length). Common mistake: stitching too far from the tape edge, leaving the raw edge exposed. Keep the needle close to the tape edge for a secure bind.
- 3. Fold and stitch the tape over the edge: Fold the tape over the raw edge to the wrong side of the fabric. Press with an iron (cotton setting) to set the fold. Stitch again from the right side, this time catching the folded tape underneath. Common mistake: not pressing the fold, which causes the tape to shift and create uneven coverage. A good press prevents shifting and gives a professional finish.
- 4. Reinforce strap attachments: Cut a 2–3 inch piece of twill tape and place it over the strap end where it meets the bag body, covering the stitching area. Stitch through all layers. This distributes stress and prevents the strap from pulling out. Common mistake: using too short a piece that does not cover the full attachment area. A longer reinforcement piece adds strength without bulk.
- 5. Finish with a clean trim (optional): For a decorative edge on leather or waxed canvas, sew the tape along the bag opening or pocket edge, folding the raw ends under 1/2 inch. Topstitch 1/8 inch from both edges of the tape. Common mistake: skipping the end fold, which leaves frayed edges visible. Folding the ends under gives a neat, finished look.
Product used in this guide
- Cotton Twill Tape: Heavy-duty 1” cotton twill tape, sold in 1 yard increments. Great for binding seams in bag making. You can buy exactly the length needed for your pattern, and the 1-inch width works with most seam allowances without trimming.
Cotton Twill Tape
